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<TITLE>The Answer Guy 48: Files invisible via Telnet?</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H4>By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
LinuxCare,
<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>Files invisible via Telnet?</H3>
<p><strong>From Norris on Mon, 11 Oct 1999
</strong></p>
<!-- ::
Files invisible via Telnet?
~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG>
First off, thank you for a good site, a real valuable source on
all those little (and not so little) problems you run into
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle">
</STRONG></P>
<P><STRONG>
Second, im not sure if I should go and ask questions directly to
you, but it seems others have done so, but if i am in error,
please just ignore me
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle">
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
You did it right: mail to the <A HREF="mailto:linux-questions-only@ssc.com"
>linux-questions-only@ssc.com</A>.
It's a shame that so many people still send their
questions to <A HREF="mailto:jimd@starshine.org"
>jimd@starshine.org</A> (which is the same
mailbox) because I can auto-sort LG mail from
personal mail. However, that just comes with the
territory.
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
The Problem:
</STRONG></P>
<P><STRONG><BlockQuote>
I have allowed telnet acces to my server, and i can login fine, i
can su and so forth, but a lot of files just dont show up via
telnet? i have messed with many combinations of file permissions,
but that doesnt seem to do it... any help would be appreciated,
thank you
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle">
</BlockQuote></STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Linux and UNIX have no mechanism for selectively "hiding"
files based on the protocol through which you've logged
in. Unless you are running your telnet daemon or inetd
in a "chroot jail" (a fairly obscure custom configuration)
then you should be able to see everything.
</BLOCKQUOTE>
<BLOCKQUOTE>
Now, if you mean that some files don't appear to be readable
through your terminal (you do an 'ls' and see "blanks"
where there should be files) then that's another matter
entirely. Trying using the command:
</BLOCKQUOTE>
<BLOCKQUOTE><BlockQuote><Code>
ls --color=never
</Code></BlockQuote></BLOCKQUOTE>
<BLOCKQUOTE>
... if your files are suddenly visible then you're just
suffering from a bad terminal type (TERM environment
variable) setting.
</BLOCKQUOTE>
<BLOCKQUOTE>
You could also try the commands:
</BLOCKQUOTE>
<BLOCKQUOTE><BlockQuote>
export TERM=dumb
find . | less
</BlockQuote></BLOCKQUOTE>
<BLOCKQUOTE>
... (assuming you're using a Bourne compatible shell -- like
the default 'bash'). This should show you all your files.
</BLOCKQUOTE>
<BLOCKQUOTE>
The 'ls --color' trick has to do with the ncurses color
support in the GNU version of 'ls'. Some distributions
set a system default alias like: alias ls='ls --color=auto'
so that you'll see your files in pretty colors when using
a color capable terminal (such as the console, or a
color xterm). If your TERM environment variable is set
correctly, and your terminfo libraries and data files are
installed correctly then this alias should automatically
disable the use of color when necessary.
</BLOCKQUOTE>
<BLOCKQUOTE>
Unfortunately the MS Windows version of TELNET.EXE is
pretty wretched. It defaults to settings which do not
implement enough VT100, VT220 or VT330 support to be usable
for most Linux tasks. You're usually better off forcing
that telnet client to use the older, less powerful VT52
mode. You'd be MUCH better off to replace it with a
good telnet client, such at K'95 (The Win '95 port
of Columbia University's Kermit package).
</BLOCKQUOTE>
<BLOCKQUOTE>
Of course I'm just guessing at what you mean by
"invisible." It's possible that you are in a
"chroot" jail (in which case you wouldn't see ANY
files and directories "above" a certain point in
the real directory tree. This would probably be
quite confusing to you since you'd have to have
duplicate <TT>/etc</TT>, <TT>/dev</TT>, and <TT>/usr/bin</TT> directory
structures and filesets.
</BLOCKQUOTE>
<BLOCKQUOTE>
I've set up systems like that (in fact I've just
configure my new personal workstation in this way
this weekend). However it's a relatively obscure
and advanced technique that almost no one uses.
You couldn't have set that up "accidentally" or
without knowing about it.
</BLOCKQUOTE>
<BLOCKQUOTE>
So I'm assuming the more likely interpretation of
your question. (I usually have to do that in this
business).
</BLOCKQUOTE>
<!-- sig -->
<!-- end 24 -->
<!--startcut ======================================================= -->
<P> <hr> <P>
<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 48 December 1999</H5>
<H6 ALIGN="center">HTML transformation by
<A HREF="mailto:star@starshine.org">Heather Stern</a> of
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
</H6>
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