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|
#!/bin/bash
#
# $Id: gmtswitch,v 1.16 2011/07/13 21:59:15 guru Exp $
#
# gmtswitch - switch between several installed GMT versions
#
function checkinput()
{ # Make sure argument is an integer
echo $1 | grep -Eq '^(\+|-)?[0-9]+$'
echo $?
}
help=0
if [ $# -gt 1 ]; then
help=1
fi
if [ $# -eq 1 ] && [ "X$1" = "X-help" ]; then
help=1
fi
if [ $help -eq 1 ]; then
cat << EOF >&2
usage: gmtswitch [version]
version, if present, is a unique text pattern identifying a GMT version,
e.g., GMT4.5.7. If none are given then we list available versions and
let the user choose one. If the version is given as "init" OR it is the
very first time gmtswitch is run we will initialize the list of versions.
EOF
exit
fi
#--------------------------------------------------------------------------------
# Get the functionality of echo -n
#--------------------------------------------------------------------------------
if [ x`echo -n` = x ]; then # echo -n works
echon()
{
echo -n "$*"
}
elif [ x`echo -e` = x ]; then # echo -e works
echon()
{
echo -e "$*"'\c'
}
else # echo with escapes better work
echon()
{
echo "$*"'\c'
}
fi
here=`pwd`
cd ~
home=`pwd`
if [ ! -f $home/.gmtversions ]; then # No .gmtversions exists yet, first do that part
cat << EOF >&2
GMTSWITCH $Revision: 1.16 $
gmtswitch helps you modify your environment to allow for the switching back
and forth between several GMT versions, in particular GMT 5.x and previous GMT
versions such as GMT 4.5.7. First, we need to determine all the GMT versions
currently installed on this platform. If you have not already installed the latest GMT 5
please CTRL-C at the prompt and do that install first. Otherwise, hit RETURN
and please be patient while we search your system.
EOF
echon "==> Press RETURN to continue: " >&2
read s
echon "--> Searching..." >&2
( find / -type d -name 'GMT[34].*' -print > $home/.gmtversions ) 2> /dev/null
n=`cat $home/.gmtversions | wc -l | awk '{print $1}'`
cat << EOF >&2
There are $n GMT versions currently installed on your system.
Before we can allow for switching you must prepare your environment.
1. CSH OR TCSH USERS
In your .cshrc or .tcshrc file:
Change your path statement. Make sure it includes $home/this_gmt/bin
2. BASH USERS
(re)Place these lines in your .profile file:
Change your PATH statement. Make sure it includes $home/this_gmt/bin
Now, please make these edits and logout and back in again. The next time
you run gmtswitch we will be able to do the switching.
CVS USERS: You will have to manually add the path to the GMT directory since
it is not considered an official release.
EOF
exit
fi
if [ "X$1" = "XD" ]; then # First entry is default
line=`head -1 $home/.gmtversions`
rm -f $home/this_gmt
ln -sf $line $home/this_gmt
elif [ $# -eq 1 ]; then
line=`grep $1 $home/.gmtversions`
nl=`grep $1 $home/.gmtversions | wc -l`
if [ $nl -eq 0 ]; then
echo "Version $1 is not listed among recognized GMT versions" >&2
echo "Run gmtswitch -help for more information" >&2
exit
fi
if [ $nl -ne 1 ]; then
echo "Version $1 is not unique among recognized GMT versions" >&2
echo "Run gmtswitch without argument and choose from a menu" >&2
exit
fi
rm -f $home/this_gmt
ln -sf $line $home/this_gmt
else
n=`cat $home/.gmtversions | wc -l | awk '{print $1}'`
i=0
while [ $i -lt $n ]; do
i=`expr $i + 1`
line=`sed -n ${i}p $home/.gmtversions`
version=`basename $line`
echo "$i. Version $version" >&2
done
echo "" >&2
v=-1
while [ $v -lt 0 ] || [ $v -gt $n ]; do
echon "Please choose a version (1-$n) [1]: " >&2
read v
if [ "X$v" = "X" ]; then
v=1
fi
result=`checkinput $v`
if [ $result -eq 1 ]; then
echon "ERROR: You must give an integer from 1-$n" >&2
v=-1
fi
done
line=`sed -n ${v}p $home/.gmtversions`
rm -f $home/this_gmt
ln -sf $line $home/this_gmt
fi
|
