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|
<!--startcut ==========================================================-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<title>More 2 Cent Tips & Tricks Issue 20</title>
</head>
<BODY BGCOLOR="#EEE1CC" TEXT="#000000" LINK="#0000FF" VLINK="#0020F0"
ALINK="#FF0000">
<!--endcut ============================================================-->
<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>
"</H4>
<P> <hr> <P>
<!-- QUICK TIPS SECTION ================================================== -->
<center>
<H1><A NAME="tips"><IMG ALIGN=MIDDLE ALT="" SRC="../gx/twocent.gif">
More 2¢ Tips!</A></H1> <BR>
Send Linux Tips and Tricks to <A HREF="mailto:gazette@ssc.com">
gazette@ssc.com
</A></center>
<p><hr><p>
<H3>Contents:</H3>
<ul>
<li><a HREF="./lg_tips20.html#info">Boot Information Display</a>
<li><a HREF="./lg_tips20.html#glimp">Consider Glimpse Instead of Grep</a>
<li><a HREF="./lg_tips20.html#copy">Diald Remote Control</a>
<li><a HREF="./lg_tips20.html#tool">A New Tool for Linux</a>
<li><a HREF="./lg_tips20.html#hex">Hex Dump</a>
<li><a HREF="./lg_tips20.html#disk">Hard Disk Duplication</a>
<li><a HREF="./lg_tips20.html#tree">More on Grepping Files in a Directory
Tree</a>
<li><a HREF="./lg_tips20.html#disk2">More on Hard Disk Duplication</a>
<li><a HREF="./lg_tips20.html#script">A Script to Update McAfee Virus</a>
<li><a HREF="./lg_tips20.html#log">Handling Log Files</a>
<li><a HREF="./lg_tips20.html#hint">Exciting New Hint on xterm Titles</a>
<li><a HREF="./lg_tips20.html#line">C Source with Line Numbers</a>
<li><a HREF="./lg_tips20.html#package">Another Reply to "What Packages Do I
Need?"</a>
<li><a HREF="./lg_tips20.html#exec">Grepping Files in a Tree with -exec</a>
<li><a HREF="./lg_tips20.html#virtual">How Do You Un-Virtual a Virtual
Screen?</a>
<li><a HREF="./lg_tips20.html#size">File Size Again...</a>
<li><a HREF="./lg_tips20.html#syslog">Syslog Thing</a>
<li><a HREF="./lg_tips20.html#ascii">Ascii Problems with FTP</a>
<li><a HREF="./lg_tips20.html#squake">Running Squake from Inside X</a>
<li><a HREF="./lg_tips20.html#copying">Copying a Tree of Files</a>
<li><a HREF="./lg_tips20.html#shar">Using shar + RCS to Backup Sets of
Source Files</a>
<li><a HREF="./lg_tips20.html#learning">Learning Experiences</a>
<li><a HREF="./lg_tips20.html#comments">LG #19, Grepping Files Comments</a>
</ul>
<P> <hr> <P>
<!--================================================================-->
<a name="info"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Boot Information Display
</H3>
<P>
Date: Wed, 2 Jul 1997 18:18:11 -0400<br>
From: Jon Cox <a href="mailto:jcox@cs.tufts.edu">jcox@cx.tufts.edu</a>
<P>
I saw an article in July's LG that talked about using watch as a better
way to monitor ftp downloads -- there 's an even BETTER way:
Check out ncftp. It works much like ftp, but shows a progress bar,
estimates time to completion, and saves bookmarks of where you've been.
I think ncftp is pretty standard on all distributions these days.
<p> -Enjoy
Jon
<P> <hr> <P>
<!--================================================================-->
<a name="glimp"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Consider Glimpse Instead of Grep
</H3>
<P>
Date: Wed, 2 Jul 1997 18:18:11 -0400<br>
From: Jon Cox <a href="mailto:jcox@cs.tufts.edu">jcox@cx.tufts.edu</a>
<P>
While grep works as a tool for searching through a big directory tree
for a string, it's pretty slow for this kind of thing & a much better
tool exists --<B>Glimpse</B>. It even has an agrep-style stripped down
regexp capability for doing "fuzzy search", and is astonishingly fast.
Roughly speaking:<br>
<I>glimpse is to grep as<br>
locate is to find</I>
<p>I believe the latest rpm version is glimpse-4.0-4.i386.rpm
You can find it in any site that mirrors Red hat's contrib directory.
<p> Enjoy!<br>
-Jon
<P> <hr> <P>
<!--================================================================-->
<a name="copy"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Diald Remote Control
</H3>
<P>
Date: Wed, 2 Jul 1997 18:18:11 -0400<br>
From: Wim Jongman <a
href="mailto:dblyuiam@xs4all.nl">dblyuiam@xs4all.nl</a>
<P>
I have hacked a helpful utility. Please have a look at it.
<p>Regards,<br>
Wim Jongman
<HR>
<H2>
Diald Remote Control</H2>
<HR>
<P>I have been a satisfied diald user for quite some time. one of
the things that were on my list of favorites was the possibility to activate
the link from another location. I have written a small shell script
that waits for activity on my telephone line.
<P>If activity has been detected the script submits the ping utility
which causes diald to set up a link to my ISP. If activity
is detected from the inside (diald does the dialing) then the ping is also
performed but there can be no harm in that.
<P>My /etc/diald.conf looks like this:
<P><TT>mode cslip</TT>
<BR><TT>connect /usr/local/bin/connect</TT>
<BR><TT>device <I><FONT COLOR="#CC66CC">/dev/cua2</FONT></I></TT>
<BR><TT>speed 115200</TT>
<BR><TT>modem</TT>
<BR><TT>lock</TT>
<BR><TT>crtscts</TT>
<BR><I><TT><FONT COLOR="#CC66CC">local local.ip.ad.dres</FONT></TT></I>
<BR><I><TT><FONT COLOR="#CC66CC">remote ga.te.way.address</FONT></TT></I>
<BR><TT>mtu 576</TT>
<BR><TT>defaultroute</TT>
<BR><I><TT><FONT COLOR="#CC66CC">ip-up /usr/local/bin/getmail &</FONT></TT></I>
<BR><TT><FONT COLOR="#FF0000">ip-down /usr/local/bin/waitmodem &</FONT></TT>
<BR><TT>include /usr/lib/diald/standard.filter</TT>
<P>The first time the link goes down, the program waitmodem is submitted.
The script for /usr/local/bin/waitmodem is:
<P><TT>#!/bin/bash</TT><TT></TT>
<P><TT># This script waits for data entering the modem. If data has arrived,</TT>
<BR><TT># then a host is pinged to allow diald to</TT>
<BR><TT># setup a connection (and you to telnet in.)</TT><TT></TT>
<P><TT>if test -f /var/locks/waitmodem</TT>
<BR><TT> then</TT>
<BR><TT> exit 0</TT>
<BR><TT> else</TT>
<BR><TT> touch /var/locks/waitmodem</TT>
<BR><TT> sleep 5</TT>
<BR><TT> read myvar < <I><FONT COLOR="#CC66CC">/dev/cua2</FONT></I></TT>
<BR><TT> ping -c 10 <I><FONT COLOR="#CC66CC">host.com</FONT></I> >
/dev/nul & > /dev/nul</TT>
<BR><TT> rm /var/locks/waitmodem</TT>
<BR><TT> exit 0</TT>
<BR><TT>fi</TT>
<P>If the diald decides to drop the link, the ip-down keyword activates
the waitmodem script. This creates a lock in /var/lock(s) and sleeps for
five seconds to allow the modem buffers to flush. Then the modem device
is read and if activity occurs, the ping is submitted. Change the <I>italic</I>
bits in the scripts. The lock is removed and diald dials out. This allows
you to access your machine. I guess you have to have a static ip for it
to be useful.
<P>Regards,
<P>Wim Jongman
<P> <hr> <P>
<!--================================================================-->
<a name="tool"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
A New Tool for Linux
</H3>
<P>
Date: Wed, 2 Jul 1997 18:18:11 -0400<br>
From: Jordi Sanfeliu <a
href="mailto:mikaku@arrikis.es">mikaku@arrakis.es</a>
<P>
hi !<br>
<p>This is my contribution to this beautiful gazette !! :))
<P><B>tree</B> is a simple tool that allows you to see the whole directory tree on
your hard disk.
<p>I think that is very cool, no?
<pre>
#!/bin/sh
# @(#) tree 1.1 30/11/95 by Jordi Sanfeliu
# email: mikaku@arrakis.es
#
# Initial version: 1.0 30/11/95
# Next version : 1.1 24/02/97 Now, with symbolic links
#
# Tree is a tool for view the directory tree (obvious :-) )
#
search () {
for dir in `echo *`
do
if [ -d $dir ] ; then
zz=0
while [ $zz != $deep ]
do
echo -n "| "
zz=`expr $zz + 1`
done
if [ -L $dir ] ; then
echo "+---$dir" `ls -l $dir | sed 's/^.*'$dir' //'`
else
echo "+---$dir"
cd $dir
deep=`expr $deep + 1`
search # with recursivity ;-)
numdirs=`expr $numdirs + 1`
fi
fi
done
cd ..
if [ $deep ] ; then
swfi=1
fi
deep=`expr $deep - 1`
}
# - Main -
if [ $# = 0 ] ; then
cd `pwd`
else
cd $1
fi
echo "Initial directory = `pwd`"
swfi=0
deep=0
numdirs=0
zz=0
while [ $swfi != 1 ]
do
search
done
echo "Total directories = $numdirs"
</pre>
<p>Have fun !<br>
Jordi
<P> <hr> <P>
<!--================================================================-->
<a name="hex"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Hex Dump
</H3>
<P>
Date: Wed, 18 Jun 1997 10:15:26 -0700<br>
From: James Gilb <a href="mailto:p27451@am371.geg.mot.com">p27451@am371.geg.mot.com</a>
<P>
I liked your gawk solution to displaying hex data. Two things (which
people have probably already pointed out to you).
<ol>
<li>If you don't want similar lines to be replaced by * *, use the -v
option to hexdump. From the man page:
<p><b>-v</b>: The -v option causes hexdump to display all input data.
Without the -v option, any number of groups of output lines,
which would be identical to the immediately preceding group
of output lines (except for the input offsets), are replaced
with a line comprised of a single asterisk.
<li>In emacs, you can get a similar display using ESC-x hexl-mode. The
output looks something like this:
<pre>00000000: 01df 0007 30c3 8680 0000 334e 0000 00ff ....0.....3N....
00000010: 0048 1002 010b 0001 0000 1a90 0000 07e4 .H..............
00000020: 0000 2724 0000 0758 0000 0200 0000 0000 ..'$...X........
00000030: 0000 0760 0004 0002 0004 0004 0007 0005 ...`............
00000040: 0003 0003 314c 0000 0000 0000 0000 0000 ....1L..........
00000050: 0000 0000 0000 0000 0000 0000 2e70 6164 .............pad
00000060: 0000 0000 0000 0000 0000 0000 0000 0014 ................
00000070: 0000 01ec 0000 0000 0000 0000 0000 0000 ................
00000080: 0000 0008 2e74 6578 7400 0000 0000 0200 .....text.......
00000090: 0000 0200 0000 1a90 0000 0200 0000 2a98 ..............*.</pre>
<p>(I don't suppose it is surprising that emacs does this, after all, emacs
is not just and editor, it is its own operating system.)
</ol>
<P> <hr> <P>
<!--================================================================-->
<a name="disk"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Hard Disk Duplication
</H3>
<P>
Date: Tue, 24 Jun 1997 11:54:48 +0200<br>
From: Jerko Golubovic <a href="mailto:jerko.golubovic@public.srce.hr">jerko.golubovic@public.srce.hr</a>
<P>
<p>A comment on article "HARD DISK DUPLICATION" written by
mcablec@ucsd.edu in Linux Gazette #18 (June 97).
<p>What I did at my place is following:
<p>I SetUp root-NFS system to boot usable configuration over network. I
just need a floppy with appropriate kernel command-line and system
brings up.
<p>When system brings up I mount as /root NFS volume where I store
compressed images. In that way I have them readily available when I
log-in.
<p>With dmesg I find about geometry of the hard disk of the target system.
Then, for taking a new image I do:
<pre>cat /dev/hda | gzip -9 > <somename>.gz</pre>
<p>And for restore:
<pre>zcat <somename>.gz > /dev/hda</pre>
<p>Of course, I don't have to use such system. It is enough to prepare one
boot floppy containing just FTP client and network config. I made two
shell scripts:
<pre>
b:
----------------------
#!/bin/sh
cat /dev/hda | gzip -9
r:
----------------------
#!/bin/sh
gzip -d > /dev/hda
Then, in FTP you do:
put |./b <somename>.gz - to save image
get <somename.gz> |./r - to restore image
</pre>
<p>ANY FTP server on ANY platform can be used for storage.
<p>Not only that - you don't have to use FTP at all - you can use smbclient
instead - and read directly from Win or Lanman shares - doing basically
the same thing.
<P> <hr> <P>
<!--================================================================-->
<a name="tree"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
More on Grepping Files in a Directory Tree
</H3>
<P>
Date:Tue, 1 Jul 1997 13:12:34<br>
From: Gene Gotimer <a href="mailto:gotimer@cybercash.com">gotimer@cybercash.com</a>
<P>
In Linux Gazette Issue 18, Earl Mitchell (earlm@Terayon.COM) suggested
<pre> grep foo `find . -name \*.c -print`</pre>
<p>as a way to grep files in a directory tree. He warned about a command
line character limit (potentially 1024 characters).
<p>Another way to accomplish this, without the character limit, is to use
the xargs command:
<pre>find . -name '*.c' -print | xargs grep foo</pre>
<p>The xargs command accepts arguments on standard input, and tacks them
on the end of the specified command (after any supplied parameters).
<p>You can specify where in the command xargs will place the arguments
(rather than just on the end) if you use the -i option and a pair of
curly braces wherever you want the substitution:
<pre>ls srcdir | xargs -i cp srcdir/{} destdir/{}</pre>
<p>xargs has a number of options worth looking at, including -p to
confirm each command as it is executed. See the man page.
<p>
--
Gene Gotimer
<P> <hr> <P>
<!--================================================================-->
<a name="disk2"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
More on Hard Disk Duplication
</H3>
<P>
Date: Mon, 23 Jun 1997 08:45:48 +0200<br>
From: Jean-Philippe CIVADE <a href="mailto:jpcivade@cge-ol.fr">jpcivade@cge-ol.fr</a><br>
<P>
I've written an utility under Windows 95 able to copy from disk to disk
in a biney way. It's called Disk2file. It's findable on my web site under
tools. The primary purpose of this utility was to make iso images from
a hard disk (proprietary file system) to record them on a cdrom. I've
used it yesterday do duplicate a red hat 4.1 installed disk with success.
The advantage of this method is this is possible to product a serial of
disk very quickly. This utility is written to tranfert up to 10Mb /s.
The duplication time for a 540 Mb is about 10 mins.
<p>The way to use it is:
<ol>
<li>start the program. Select scsi controller.
<li>Select a disk and a file where to put image file
<li>Select the source disk
<li>select disk2file mode and click "run"
<li>after completion, select the new disk where the image have to be
written
<li>Select file2disk mode
<li>Click run
</ol>
<p>It's referenced as a shareware in the docs but I conced the freeware
mode to the Linux community for disk duplication only.
<p>
--
Best Regards
Jean-Philippe CIVADE
<P> <hr> <P>
<!--================================================================-->
<a name="script"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
A Script to Update McAfee Virus
</H3>
<P>
Date: Fri, 20 Jun 1997 00:05:33 -0500 (CDT)<br>
From: Ralph <a href="mailto:ralphs@kyrandia.com">ralphs@kyrandia.com</a><br>
<P>
Here is a script I hacked together (trust me after you see it I'm sure
you'll understand why this is my first script hack I'm sure) to ftp McAfee
virus definitions unzip then and run a test to make sure they are ok...now
ya gotta have vscan for linux located at
<a href="ftp://ftp.mcafee.com/pub/antivirus/unix/linux">ftp://ftp.mcafee.com/pub/antivirus/unix/linux</a>
<p>the first one does the work of pulling it down unzipping and testing
<pre>
#!/bin/sh
# =====================================================================
# Name: update-vscan
# Goal: Auto-update McAfee's Virus Scan for Linux
# Who: Ralph Sevy ralphs@kyrandia.com
# Date: June 19 1997
# ----------------------------------------------------------------------
# Run this file on the 15th of each month to insure that the file gets
# downloaded
# ======================================================================
datafile=dat-`date +%y%m`.zip
mcafeed=/usr/local/lib/mcafee
ftp -n ftp.mcafee.com << !
user anonymous root@home.com
binary
cd /pub/antivirus/datfiles/2.x
get $datafile
quit
!
if [ -f $mcafeed/*.dat ]; then
rm *.dat
fi
unzip $datafile *.DAT -d $mcafeed
for file in $(ls $mcafeed/*.DAT); do
lconvert $mcafeed/*.DAT
done
uvscan $mcafeed/*
exit
---------------------------------------------------------------------------
CUT HERE
lconvert is a 3 line script I stole looking in the gazette
CUT HERE
--------------------------------------------------------------------------
#!/bin/tcsh
# script named lconvert
foreach i (*)
mv $1 `echo $1 | tr '[A-Z]' '[a-z]'`
-------------------------------------------------------------------------
CUT HERE
</pre>
<p>The last thing you want to do is add an entry to crontab to update your
files once a month....I prefer the 15th as it makes sure I get the file
(dunno really how to check for errors yet, its my next project)
<pre>
# crontab command line
# update mcafee data files once a month on the 15th at 4am
* 4 15 * * /usr/local/bin/update-vscan
</pre>
<p>Its not pretty I'm sure, but it works
<p>
Ralph
<a href="http://www.kyrandia.com/~ralphs">http://www.kyrandia.com/~ralphs</a>
<P> <hr> <P>
<!--================================================================-->
<a name="log"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Handling Log Files
</H3>
<P>
Date: Thu, 3 Jul 1997 11:13:56 -0400<br>
From: Neil Schemenauer <a href="mailto:nas170@mail.usask.ca">nas170@mail.usask.ca</a>
<P>
I have seen a few people wondering what to do with log files that keep
growing. The easy solution is to trim them using:
<pre>cat </dev/null >some_filename</pre>
The disadvantage to this method is that all your logged data is gone,
not just the old stuff. Here is a shell script I use to prevent this
problem.
<pre>
#!/bin/sh
#
# usage: logroll [ -d <save directory> ] [ -s <size> ] <logfile>
# where to save old log files
SAVE_DIR=/var/log/roll
# how large should we allow files to grow before rolling them
SIZE=256k
while :
do
case $1 in
-d)
SAVE_DIR=$2
shift; shift;;
-s)
SIZE=$2
shift;shift;;
-h|-?)
echo "usage: logroll [ -d <save directory> ] [ -s <size> ] <logfile>"
exit;;
*)
break;;
esac
done
if [ $# -ne 1 ]
then
echo "usage: logroll [ -d <save directory> ] [ -s <size> ] <logfile>"
exit 1
fi
if [ -z `find $1 -size +$SIZE -print` ]
then
exit 0
fi
file=`basename $1`
if [ -f $SAVE_DIR/$file.gz ]
then
/bin/mv $SAVE_DIR/$file.gz $SAVE_DIR/$file.old.gz
fi
/bin/mv $1 $SAVE_DIR/$file
/bin/gzip -f $SAVE_DIR/$file
# this last command assumes the PID of syslogd is stored like RedHat
# if this is not the case, "killall -HUP syslogd" should work
/bin/kill -HUP `cat /var/run/syslog.pid`
</pre>
Save this script as /root/bin/logroll and add the following to your
/etc/crontab:
<pre>
# roll log files
30 02 * * * root /root/bin/logroll /var/log/log.smb
31 02 * * * root /root/bin/logroll /var/log/log.nmb
32 02 * * * root /root/bin/logroll /var/log/maillog
33 02 * * * root /root/bin/logroll /var/log/messages
34 02 * * * root /root/bin/logroll /var/log/secure
35 02 * * * root /root/bin/logroll /var/log/spooler
36 02 * * * root /root/bin/logroll /var/log/cron
38 02 * * * root /root/bin/logroll /var/log/kernel
</pre>
Now forget about log files. The old log file is stored in
/var/log/roll and gzipped to conserve space. You should have lots of
old logging information if you have to track down a problem.
<p>Neil
<P> <hr> <P>
<!--================================================================-->
<a name="hint"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Exciting New Hint on xterm Titles
</H3>
<P>
Date: Fri, 27 Jun 1997 15:43:44 +1000 (EST)<br>
From: Damian Haslam <a href="mailto:damian@srsuna.shlrc.mq.edu.au">damian@srsuna.shlrc.mq.edu.au</a><br>
<P>
Hi, after searching (to no avail) for a way to display the currently
executing process in the xterm on the xterm's title bar, I resorted to
changing the source of bash2.0 to do what I wanted.
from line 117 of eval.c in the source, add the lines marked with <tt>#</tt> (but
don't include the <tt>#</tt>)
<pre>
117: if (read_command () == 0)
118: {
#119: if (strcmp(get_string_value("TERM"),"xterm") == 0) {
#120: printf("^[]0;%s^G",make_command_string(global_command));
#121: fflush(stdout);
#122: }
#123:
124: if (interactive_shell == 0 && read_but_dont_execute)
.....
</pre>
you can then set PROMPT_COMMAND to reset the xterm title to the pwd, or
whatever takes your fancy.
<p>cheers - damian
<P> <hr> <P>
<!--================================================================-->
<a name="dmesg"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
C Source with Line Numbers
</H3>
<P>
Date: Sun, 29 Jun 1997 10:09:52 -0400 (EDT)<br>
From: Tim Newsome <a href="mailto:drz@froody.bloke.com">drz@froody.bloke.com</a>
<P>
Another way of getting a file numbered:
<pre>grep -n $ <filename></pre>
<pre>-n</pre> tells grep to number its output, and $ means end-of-line. Since every line
in the file has an end (except possibly the last one) it'll stick a number in
front of every line.
<p>
Tim
<P> <hr> <P>
<!--================================================================-->
<a name="package"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Another Reply to "What Packages Do I Need?"
</H3>
<P>
Date: Wed, 02 Jul 1997 20:17:26 +0900<br>
From: Matt Gushee <a href="mailto:matt@it.osha.sut.ac.jp">matt@it.osha.sut.ac.jp</a>
<P>
About getting rid of X components, Michael Hammel wrote that "...you
still need to hang onto the X applications (/usr/X11R6/bin/*)." We-e-ll,
I think that statement needs to be qualified. Although I'm in no sense
an X-pert, I've poked around and found quite a few non-essential
components: multiple versions of xclocks (wristwatches are more accurate
and give your eyes a quick break). Xedit (just use a text-mode editor in
an xterm). Fonts? I could be wrong, but I don't see any reason to have
both 75 and 100dpi fonts; and some distributions include Chinese &
Japanese fonts, which are BIG, and which not everyone needs. Anyway,
poking around for bits and pieces you can delete may not be the best use
of your time, but the point is that X seems to be packaged with a very
broad brush. By the way, I run Red Hat, but I just installed the new
(non-rpm) XFree86 3.3 distribution--and I notice that Red Hat packages
many of the non-essential client programs in a separate contrib
package, while the Xfree86 group puts them all in the main bin/ package.
<p>Here's another, maybe better idea for freeing up disk space: do you have
a.out shared libraries? If you run only recent software, you may not
need them. I got rid of my a.out libs several months ago, and have
installed dozens of programs since then, and only one needed a.out (and
that one turned out not to have the features I needed anyway). Of
course, I have the RedHat CD handy so I can reinstall them in a moment
if I ever really need them.
<p>That's my .02 .<br>
--Matt Gushee
<P> <hr> <P>
<!--================================================================-->
<a name="exec"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Grepping Files in a Tree with -exec
</H3>
<P>
Date: Wed, 2 Jul 1997 09:46:33 -0400 (EDT)<br>
From: Clayton L. Hynfield <a href="mailto:hynfiecl@mnemo.mcs.muohio.edu">hynfiecl@mnemo.mcs.muohio.edu</a><br>
<P>
Don't forget about find's -exec option:
<pre>find . -type f -exec grep foo {} \;</pre>
<p>Clayton L. Hynfield
<P> <hr> <P>
<!--================================================================-->
<a name="virtual"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
How Do You Un-Virtual a Virtual Screen?
</H3>
<P>
Date: Mon, 07 Jul 97 15:08:39 +1000<br>
From: Stuart Lamble <a href="mailto:lamble@yoyo.cc.monash.edu.au">lamble@yoyo.cc.monash.edu.au</a><br>
<P>
With regards to changing the size of the X screen, I assume you're using
XFree86. XFree will make your virtual screen size the larger of:
*the specified virtual screen size
*the _largest_ resolution you _might_ use with your video card
(specified in 'Section "Screen"').
<p>Open your XF86Config file in any text editor (ae, vi, emacs, jed, joe, ...)
_as root_. (You need to be able to write it back out again.) Search for
"Screen" (this is, IIRC, case insensitive, so for example, under vi, you'd
type:
<pre>/[Ss][Cc][Rr][Ee][Ee][Nn]</pre>
yeah, yeah, I know there's some switch somewhere that makes the search
case insensitive (or if there isn't, there _should_ be :), but I can't
remember it offhand; I don't have much use for such a thing.)
<p>You'll see something like:
<pre>
Section "Screen"
Driver "accel"
Device "S3 Trio64V+ (generic)"
Monitor "My Monitor"
Subsection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
ViewPort 0 0
Virtual 1024 768
EndSubsection
Subsection "Display"
Depth 16
Modes "800x600" "640x480"
ViewPort 0 0
Virtual 800 600
EndSubsection
Subsection "Display"
Depth 24
Modes "640x480"
ViewPort 0 0
Virtual 640 480
EndSubsection
EndSection
</pre>
(this is taken from a machine I use on occasion at work.)
<p>The first thing to check is the lines starting with Virtual. If you want
the virtual resolution to be the same as the screen size, it's easy to do -
just get rid of the Virtual line, and it'll be set to the highest
resolution listed in the relevant Modes line. (In this case, for 24bpp,
it would be 640x480; at 16bpp, 800x600; at 8bpp, 1024x768.) Just be
aware that if you've got a 1600x1200 mode at the relevant depth listed,
the virtual screen size will stay at 1600x1200. You'd need to get rid of
the higher resolution modes in this case.
<p>I would strongly recommend you make a backup of your XF86Config file
before you mess around with it, though. It's working at the moment;
you want to keep it that way :-)
<p>All of this is, of course, completely incorrect for MetroX, or any other
commercial X server for Linux.
<p>Cheers.
<P> <hr> <P>
<!--================================================================-->
<a name="size"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
File Size Again...
</H3>
<P>
Date: Sun, 6 Jul 1997 13:13:29 -0400 (EDT)<br>
From: Tim Newsome <a href="mailto:drz@froody.bloke.com">drz@froody.bloke.com</a>
<P>
<p>Since nobody has mentioned it yet: procps (at least version 1.01) comes with a
very useful utility named watch. You can give it a command line which it will
execute every 2 seconds. So, to keep track of file size, all you really need
is:
watch ls -l filename
Or if you're curious as to who's logged on:
watch w
You can change the interval with the -n flag, so to pop up a different fortune
every 20 seconds, run:
watch -n 20 fortune
Tim
<P> <hr> <P>
<!--================================================================-->
<a name="syslog"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
syslog Thing
</H3>
<P>
Date: Fri, 04 Jul 1997 14:50:08 -0400<br>
From: Ian Quick <a href="mailto:ian@dot.superaje.com">ian@dot.superaje.com</a>
<P>
I don't know if this is very popular but my friend once told me a way
to put your syslog messages on a virtual console. First make sure that
you have the dev for what console you want. (I run RedHat 4.0 and they
have them up tty12). Then edit your syslog.conf file and add *.* <put a
few tabs for format> /dev/tty12. Reboot and TA DA! just hit alt-F12 and
there are you messages logged to a console.
<p>-Ian Quick
<P> <hr> <P>
<!--================================================================-->
<a name="ascii"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Ascii Problems with FTP
</H3>
<P>
Date: Mon, 7 Jul 1997 15:59:39 -0600 (CST)<br>
From: Terrence Martin <a href="mailto:twm139@missing.link.ca">twm139@missing.link.ca</a>
<P>
This is a common problem that occurs with many of our Windows users when
they upload html and perl cgi stuff to our web server.
<p>The real fix for this has been available for years in ftp clients
themselves. Every ftp client should have support for both 'Binary or type
I' and 'Ascii or type 2' uploads/downloads. By selecting or toggling this
option to Ascii mode (say in ws_ftp) the dos format text files are
automagically translated to unix style without the ^M. Note you definitely
do not want to transfer binary type files like apps or programs as this
translation will corrupt them.
<p>Regards<br>
Terrence Martin
<P> <hr> <P>
<!--================================================================-->
<a name="squake"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Running Squake from Inside X
</H3>
<P>
Date: Fri, 11 Jul 1997 00:27:49 -0400<br>
From: Joey Hess <a href="mailto:joey@kite.ml.org">joey@kite.ml.org</a>
<P>
I use X 99% of the time, and I was getting tired of the routine of
CTRL-ALT-F1; log in; run squake; exit; switch back to X that I had to
go through every time I wanted to run squake. So I decided to add an
entry for squake to my fvwm menus. To make that work, I had to write a
script, I hope someone else finds this useful, I call it <B>runvc</B>:
<pre>
#!/bin/sh
# Run something on a VC, from X, and switch back to X when done.
# GPL Joey Hess, Thu, 10 Jul 1997 23:27:08 -0400
exec open -s -- sh -c "$* ; chvt `getvc`"
</pre>
Now, I can just type <tt>runvc squake</tt> (or pick my fvwm menu entry that
does the same) and instantly be playing squake, and as soon as I quit
squake, I'm dumped back into X. Of course, it works equally well for
any other program you need to run at the console.
<p>Runvc is a one-liner, but it took me some time to get it working
right, so here's an explanation of what's going on. First, the
<tt>open -s</tt> command is used to switch to another virtual console (VC)
and run a program. By default, it's going to switch to the next unused
VC, which is probably VC 8 or 9. The -s has to be there to make open
actually change to that console.
<p>Next, the text after the <tt>--</tt> is the command that open runs. I want
open to run 2 commands, so I have to make a small shell script, and
this is the <tt>sh -c "..."</tt> part. Inside the quotes, I place $*, which
actually handles running squake or whatever program you told runvc to
run.
<p>Finally, we've run the command and nothing remains but to switch back
to X. This is the hard part. If you're not in X, you can use something
like <tt>open -w -s -- squake</tt> and open will run squake on a new VC, wait
for it to exit, and then automatically switch back to the VC you ran
it from. But if you try this from inside X, it just doesn't work. So I
had to come up with another method to switch back to X. I found that
the <tt>chvt</tt> command was able to switch back from the console to X, so I
used it.
<p>Chvt requires that you pass it the number of the VC to switch to. I
could just hard code in the number of the VC that X runs on on my
system, and do <tt>chvt 7</tt>, but this isn't portable, and I'd have to
update the script if this ever changed. So I wrote a program named
'getvc' that prints out the current VC. Getvc is actually run first,
before any of the rest of the runvc command line, because it's
enclosed in backticks. So getvc prints out the number of the VC that X
is running on and that value is stored, then the rest of the runvc
command line gets run, and eventually that value is passed to chvt,
which finally switches you back into X.
<p>Well, that's all there is to runvc. Here's where you can get the
programs used by it:
<ul>
<li><b>open</b>: In the open package, from
<a href="ftp://sunsite.unc.edu/pub/Linux/utils/console/open-1.4.tgz">ftp://sunsite.unc.edu/pub/Linux/utils/console/open-1.4.tgz</a>
<li><b>chvt</b>: Part of the kbd package, from
<a href="ftp://ftp.funet.fi/pub/Linux/PEOPLE/Linus/kbd-0.94.tar.gz">ftp://ftp.funet.fi/pub/Linux/PEOPLE/Linux/kdb-0.94.tar.gz</a>
<li><b>getvc</b>: I wrote this one, here's the source code, it's easy to
compile. I won't go into how it works, because I don't
understand it well - I just stole code from somewhere else and
hacked it to do what I wanted.
<pre>
/* getvc.c
* Prints the number of the current VC to stdout. Most of this code
* was ripped from the open program, and this code is GPL'd
*
* Joey Hess, Fri Apr 4 14:58:50 EST 1997
*/
#include <sys/vt.h>
#include <fcntl.h>
main () {
int fd = 0;
struct vt_stat vt;
if ((fd = open("/dev/console",O_WRONLY,0)) < 0) {
perror("Failed to open /dev/console\n");
return(2);
}
if (ioctl(fd, VT_GETSTATE, &vt) < 0) {
perror("can't get VTstate\n");
close(fd);
return(4);
}
printf("%d\n",vt.v_active);
}
/* End of getvc.c */</pre>
<p>I hope this tip isn't too long!
<p>
--
see shy jo
<P> <hr> <P>
<!--================================================================-->
<a name="copying"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Copying a Tree of Files
</H3>
<P>
Date: Fri, 18 Jul 1997 00:33:48 +0200 (SAT)<br>
From: <a href="mailto:ixion@ilink.nis.za">ixion@ilink.nis.za</a>
<P>
Hi!
<p>First of all, I want to congratulate you with your fine magazine.
Although I've been around for quite some time and known about the
existance of LG, I've never had the time (or should I say I have been
to ignorant) to read it. Well, I finally sat down and started reading
all the issues and I must say I'm impressed. Therefore I decided I
would show my gratitude by showing you some of my 2c Tips. Enjoy...
<pre>
# Quick way to copy a tree of files from one place to another
----< cptree <----
#!/bin/sh
if [ $# = 2 ]
then
(cd $1; tar cf - .) | (mkdir $2; cd $2; tar xvfp -)
else
echo "USAGE: "`basename $0`" <source_directory> <dest_directory>"
exit 1
fi
----< cptree <----
# Quick way to move a tree of files from one place to another
----< mvtree <----
#!/bin/sh
if [ $# = 2 ]
then
(cd $1; tar cf - .) | (mkdir $2; cd $2; tar xvfp -)
rm -rf $1
else
echo "USAGE: "`basename $0`" <source_directory> <dest_directory>"
exit 1
fi
----< mvtree <----
# Rename numeric files (1.*, 2.*, 3.*, etc.) to it's correct numeric
# equivalents (01.*, 02.*, 03.*, etc.). Useful to prevent incorrect wild
# card matching
----< fixnum <----
#!/bin/sh
if [ $# = 0 ]
then
FILELIST=`ls {1,2,3,4,5,6,7,8,9}.mp3` 2> /dev/null
MPFILE="empty"
chmod -x *
for MPFILE in $FILELIST
do
if [ -e $MPFILE ]; then mv $MPFILE "`echo "0$MPFILE"`"; fi
done
fi
----< fixnum <----
# This one strips the given file name from it's extension (i.e. "file.txt"
# would become "file"
----< cutbase <----
#!/bin/sh
if [ $# = 1 ]
then
dotpos=`expr index $1 "."`
if [ $dotpos -gt 0 ]
then
dotpos=`expr $dotpos - 1`
stripfile=`expr substr $1 1 $dotpos`
else
stripfile=$1
fi
echo $stripfile
else
echo " USAGE: `basename $0` <filename>"
exit 1
fi
----< cutbase <----
# If you're desperately looking for a file containing something and you
# don't have a clue where to start looking, this one might be for you.
# It greps through all the files in the given directory tree for the given
# keyword and list all the files. For example: grepall /usr/doc PAP secrets
----< grepall <----
#!/bin/sh
if [ $# = 0 ]
then
DIR="."
else
DIR=$1
shift
find $DIR -type f -exec grep -lie "$@" {} \; | less
fi
----< grepall <----
# You might have seen some of the xterm titlebar tips posted in LG. Here
# is my variation of the theme. I like my xterm to keep it's title that
# I've either specified on the command-line or the name of the program
# and after I've run programs like Midnight Commander, that's changes the
# titlebar, I want it restored to it's old value. Here is my way of doing
# it. Just put the code in /etc/profile or ~/.profile or whatever startup
# file you use...
----< Titlebar 2c tip <----
if [ $TERM = "xterm" -o $TERM = "xterm-color" -o $TERM = "rxvt" ]
then
function TitlebarString()
{
local FOUND=0
local PIDTXT=`ps | grep $PPID`
for WORDS in $PIDTXT
do
if [ $FOUND = 1 ]; then break; fi
if [ $WORDS = "-T" ]; then export FOUND=1; fi
done
if [ $FOUND = 0 ]
then
WORDS=`(for TMP in $PIDTXT;do echo -n $TMP" ";done) | cut -f5 -d" "`
if [ "`echo $WORDS | grep -i xterm`" != "" ]; then WORDS="xterm"; fi
fi
echo -n $WORDS
unset WORDS
}
if [ $COLORTERM -a $COLORTERM = "rxvt-xpm" ]
then
alias mc='mc -c;echo -ne "\033[m\033]0;`TitlebarString`\007"'
else
alias mc='mc -c;echo -ne "\033]0;`TitlebarString`\007"'
fi
fi
----< Titlebar 2c tip <----
# This is an add-on for du. It shows the total disk usage in bytes,
# kilobytes, megabytes and gigabytes (I thought terabytes wouldn't be
# necessary (: )
----< space <----
#!/bin/sh
BYTES=`du -bs | cut -f1` 2> /dev/null
if [ $BYTES -lt 0 ]
then
KBYTES=`du -ks | cut -f1` 2> /dev/null
else
KBYTES=`expr $BYTES / 1024`
fi
MBYTES=`expr $KBYTES / 1024`
GBYTES=`expr $MBYTES / 1024`
echo ""
if [ $BYTES -gt 0 ]; then echo " $BYTES bytes"; fi
if [ $KBYTES -gt 0 ]; then echo " $KBYTES KB"; fi
if [ $MBYTES -gt 0 ]; then echo " $MBYTES MB"; fi
if [ $GBYTES -gt 0 ]; then echo " $GBYTES GB"; fi
echo ""
----< space <----
# A scripty to unzip all zipfiles specified or all those in the current
# directory and remove the orginal ones (Remember that GNU zip/unzip
# doesn't support wildcards)
----< unzipall <----
#!/bin/sh
if [ $# = 0 ]
then
ZIPLIST=`ls *.zip` 2> /dev/null
else
ZIPLIST="$@"
fi
ZIPFILE="garbage"
for ZIPFILE in $ZIPLIST
do
unzip -L $ZIPFILE
done
rm -f $ZIPLIST 2> /dev/null
----< unzipall <----
# Zip all the files in the current directory seperately and wipe the
# original files. Zip's them in a dos style (i.e. hungry.txt would
# be zipped to hungry.zip and not hungry.txt.zip)
----< zipall <----
#!/bin/sh
function stripadd ()
{
local dotpos=`expr index $1 "."`
if [ $dotpos -gt 0 ]
then
dotpos=`expr $dotpos - 1`
local stripfile=`expr substr $1 1 $dotpos`
else
local stripfile=$1
fi
echo $stripfile".zip"
}
function ziplist ()
{
zipfile="garbage"
for zipfile in "$@"
do
zip -9 `stripadd $zipfile` $zipfile
rm $zipfile
done
}
if [ $# -gt 0 ]
then
ziplist "$@"
else
ziplist `ls`
fi
----< zipall <----
</pre>
<p>Okay, now for some Window manager tips. Since '95 microsoft has launched
a '95 keyboard campaign and in the process a lot of people (including me)
have ended up with keyboards containing those silly, useless buttons.
Luckily I've put them to good use. To give them the same functions in your
window manager as in doze 95, just follow the instructions:
<pre>
Edit ~/.Xmodmap and add the following lines:
keycode 115 = F30
keycode 116 = F31
keycode 117 = F32
</pre>
<p>Now, edit your window manager configuration file and bind those keys. Here
is the proper keybindings for fvwm95 and afterstep respectively
<pre>
# Fvwm95 (edit ~/.fvwm2rc95)
Key F30 A A CirculateDown
Key F31 A A CirculateUp
Key F32 A A PopUp "Utilities"
# Afterstep (edit ~/.steprc)
Key F30 A A CirculateDown
Key F31 A A CirculateUp
Key F32 A A PopUp "HotList"
</pre>
<p>Just remember that PopUp "Utilities" and PopUp "HotList" should be replaced
by your actual popup menus. If you don't known what I'm talking about, just
browse through your configuration file and read the comments - It'll become
clear very soon.
<p>I guess that's all for now. I've got some other (more useful) scripts and
tips, but they are either system specific or just to large to include here
and if I don't stop now, you'll need a seperate issue just for my tips.
<p>
Cheers<br>
ixion
<P> <hr> <P>
<!--================================================================-->
<a name="shar"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Using shar + RCS to Backup Set of Source Files
</H3>
<P>
Date: Wed, 23 Jul 1997 09:28:24 -0300<br>
From: Mario Storti <a href="mailto:mstorti@minerva.unl.edu.ar">mstorti@minerva.unl.edu.ar</a>
<P>
Hi, RCS (see rcs(1)) is a very useful tool that allows to store
versions of a file by storing only the differences between successive
versions. In this way I can make a large amounts of backups of my
source files but with a negligible amount of storage. I use it all the
time, even for TeX files!! However, when you are working with a set
of source files (*.c, shell or Perl scripts, I work mainly with
Fortran .f and Octave *.m files) what I want is to make backups of the
whole set of files in such a way that you can recover the state of the
whole package at a given time. I know that there is a script called
<B>rcsfreeze</B> around, but I know that it has problems, for instance if
you rename, delete or create new files, it is not guaranteed to
recover the same state of the whole set.
<p>I found a solution that seems to be simpler and is working for me: I
make a `shar' of the files and then a version control of the shar
file. (see shar(1)). Shar is a file that packs a set of text files in
a single text file. It has been used since a long time to send set of
files by e-mail.
<p>It would be easy to write a script for this, but I prefer to include
the shell code in a Makefile. The commands to be issued each time you
want to make a backup are:
<pre>
$ co -l source.shar
$ shar *.m Makefile >source.shar
$ ci -m"save package" source.shar
</pre>
<p>Here *.m and Makefile is the set of files that I want to backup
periodically.
<p>(I want to point out that RCS version control is far beyond the simple
fact of making backups: It serves to manage files to be worked by
different people, etc... Here I'm using a very small subset of the
utilities of RCS.)
<p>Hope this could be of use for someone else. It would be nice also to
hear of other solutions,
<p>Mario
<P> <hr> <P>
<!--================================================================-->
<a name="learning"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
Learning Experience
</H3>
<P>
Date: Wed, 23 Jul 1997 15:53:31 -0500<br>
From: Debie Scholz <a href="mailto:debie@sirinet.net">debie@sirinet.net</a><br>
<P>
If you have a ps2 style mouse and the /dev/psaux gets deleted you must do a
MAKEDEV busmice but it doesnt make a psaux it makes a psmouse so you must
make a symbolic link to psaux.;
<p>Debie Scholz<br>
Sirius Systems Group, Inc.<br>
<P> <hr> <P>
<!--================================================================-->
<a name="comments"></a>
<H3><IMG ALIGN=BOTTOM ALT="" SRC="../gx/lil2cent.gif">
LG #19, Grepping Files Comments
</H3>
<P>
Date: Wed, 30 Jul 1997 08:35:46 +0200 (MET DST)<br>
From: Werner Fleck <a href="mailto:Werner.Fleck@prompt.de">Werner.Fleck@prompt.de</a>
<P>
Hi!<br>
I have read all the 2c tips on grepping files in a directory tree but I think
all missed the ultimate tool for this: a perl script named ``mg''. With this
you can:
<ul>
<li>grep in many types of compresses archieved files e.g. tar'ed, ar'ed,
compressed, gzip'ed, zoo'ed, lha'ed...
<li>grep binary files
<li>grep only text files
<li>recursive grep in a directory tree
<li>filename pattern matching
<li>regular expresions
<li>option case insensitive match
<li>and many many more
</ul>
<p>Although it is written in perl it is very fast - I used it now for many years
and it works wonderful for me.
<p>FTP search results
<p>Hardware by Opticom ASA, ITEA and IDI. Network by UNINETT.
This server is located in Trondheim, Norway
<p>"Exact search" for "mg-2.16"
<pre>
1 -r--r--r-- 38.8K 1996 Oct 2 ftp.nuie.nagoya-u.ac.jp
/languages/perl/sra-scripts/mg-2.16
2 -rw-r--r-- 38.8K 1995 Nov 16 ftp.et-inf.fho-emden.de
/pub/.mnt2/perl/sra-scripts/mg-2.16
3 -rw-r--r-- 38.8K 1996 Oct 3 ftp.hipecs.hokudai.ac.jp
/pub/LANG/perl/utashiro/mg-2.16
4 -rw-r--r-- 38.8K 1997 Mar 4 ftp.st.ryukoku.ac.jp /pub/lang/perl/mg-2.16
5 -r--r--r-- 38.8K 1996 Oct 2 ftp.elelab.nsc.co.jp
/pub/lang/perl/scripts.sra/mg-2.16
6 -r--r--r-- 38.8K 1996 Oct 3 ftp.sra.co.jp
/pub/lang/perl/scripts/utashiro-scripts/mg-2.16
7 -r--r--r-- 38.8K 1996 Oct 3 ftp.sra.co.jp
/pub/lang/perl/sra-scripts/mg-2.16
8 -rw-r--r-- 38.8K 1995 Nov 16 ftp.fujitsu.co.jp
/pub/misc/perl/sra-scripts/mg-2.16
9 -r--r--r-- 38.8K 1996 Oct 2 ftp.eos.hokudai.ac.jp
/pub/tools/sra-scripts/mg-2.16
9 reported hits
0.018 seconds prospero
0.018 seconds HTTP
0 partial writes.
DONE
</pre>
<p>FTP search, Copyright 1994-1997 Tor Egge
<p>Greetings, Werner
<P> <hr> <P>
<!--================================================================-->
<center>Published in Linux Gazette Issue 20, August 1997</center>
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