| Re: System Variable Behavior Changed in IDL 6.0 [message #38573 is a reply to message #38475] |
Fri, 12 March 2004 15:24   |
JD Smith
Messages: 850
Registered: December 1999
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Senior Member |
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On Thu, 11 Mar 2004 10:54:27 -0600, Michael Wallace wrote:
>> By the way, what is the easiest way to switch between IDL versions under
>> linux? What I do now is using a soft link: idl -> idl_6.0 and renaming
>> it when I need to run 5.5. Aren't there any command line options?
>> Couldn't find them
>
> There aren't any command line options because IDL 5.5 and IDL 6.0 are
> two separate programs and they aren't aware that the other exists.
> While soft-linking works, you should also make sure that your IDL_PATH
> is updated to include the correct directories. You wouldn't want IDL
> 5.5 trying to use commands built for 6.0 or vice versa.
>
> A better solution would be to package the soft link command and update
> of IDL_PATH in a script. Then when you want to switch, just call that
> command. Maybe if I have time later today, I'll provide an example of
> what I'm talking about.
Attached are two scripts which work together. The first, "makelinks",
automagically makes links to run all your installed versions of idl,
including nice things like idlhelp_5.6. Just plop it in
/usr/local/rsi/ (or wherever your idl directory lives), and run from
there. I usually keep about three versions around, but any number are
supported.
The other script "idl" is a front end to all idl* commands (idlhelp,
idl, idlde). It sets IDL_DIR for you, sets up the PATH for you to
include the correct version of the IDL-shipped libraries, and lets you
add extra libraries to your path with an environment variable
IDL_EXTRA. It's great for a system-wide install because then users
don't need to bother with any environment variables. You can of
course include more system libraries in the script than just the IDL
default $IDL_DIR/lib.
Hope they help.
JD
#!/bin/bash
# makelinks: script for generating the links to run multiple versions
# of installed IDL, including the plain command line version, the
# development environment, and the online help, separately. Run this
# script after installing/deleting a new version of idl.
# NOTE: WHEN INSTALLING A NEW VERISON OF IDL, DO NOT SAY "Y" TO THE
# "MAKE LINKS" OPTION OF THE INSTALL SCRIPT WHICH RUNS AT THE END OF
# INSTALLATION (YOU CAN OPT NOT TO RUN IT, AS THIS IS ALL IT DOES).
# INSTEAD, RUN THIS SCRIPT AFTER INSTALLATION COMPLETES.
# THIS SCRIPT MUST BE AT THE MAIN RSI INSTALL LEVEL, E.G. /usr/local/rsi
# DON'T RUN makelinks UNTIL YOU'VE VERIFIED IDL IS WORKING WITH THE NEW
# LICENSE SERVER. RUN IT DIRECTLY TO CHECK.
# J.D. Smith 2000-11-5
base=$(dirname $0)
# Edit this to make the links elsewhere, but this is usually good.
destdir="$base/../bin"
[ -x $destdir/idl ] || {
echo "Cannot find the master script $destdir/idl" 1>&2;
exit 1;
}
# Kill the old links, in case we removed a directory
rm -f $destdir/idl{,de,help}_*
# Go through the installed idl directories, making links
latest="0.0"
for dir in $base/idl_*; do
[ -d $dir -a ! -L $dir -a -d $dir/bin ] || continue
vers=${dir##*/}
vers=${vers#idl_}
# Only dots and numbers, we need to compare
vers=$(echo $vers | tr -cd '[0-9].')
[ -z "$vers" ] && continue
echo VERSION $vers
for end in "" de help; do
echo "Making ${destdir}/idl${end}_${vers}";
ln -s idl ${destdir}/idl${end}_${vers};
done
# Find the latest version
major=${vers%%.*}
minor=${vers#*.}
minor=$(echo $minor | tr -d '.')
fvers="$major.$minor"
[ -n $(echo "if (${fvers}>${latest}) 1" | bc) ] && {
latest_vers=$vers;
latest=$fvers;
}
done
# Set up links for running the latest version
[ -L $destdir/idlde ] || {
echo "Making $destdir/idlde";
ln -s idl $destdir/idlde;
}
[ -L $destdir/idlhelp ] || {
echo "Making $destdir/idlhelp";
ln -s idl $destdir/idlhelp;
}
[ -L $base/idl ] && {
echo "LATEST VERSION";
echo "Making idl->idl_${latest_vers}";
rm -f idl;
ln -s idl_${latest_vers} idl;
}
#-------------------------- Cut Here ----------------------------------
# This is the idl script: put in /usr/local/bin/
#!/bin/bash
# idl: A script to run multiple versions of RSI's IDL, including
# separately the command line, the development environment, or the
# online help. Each version is linked to this script (named idl),
# with names of type "prog_vers", where prog is one of:
# idl
# idlde
# idlhelp
# and vers is the version number, like 5.2. An example is idlde_5.4.
# You can them simply say, e.g., idlhelp_5.1 to get version 5.1's
# help, or idl_5.4 to run the command-line idl version 5.4, etc. If
# you find a version available which does not work, alert the
# sysadmin.
# The full set of links for all installed version of IDL are created
# by the script "makelinks" available in the RSI install directory.
# See that script for more info. Run it after installing or deleting
# an installation of idl in the RSI install directory (often
# /usr/local/rsi, or /export/local/rsi for exported shares). The
# installation directories are by default named idl_vers
# (e.g. /export/local/rsi/idl_5.4), and this naming convention must be
# retained. If this script is run via one of its links which has no
# version number (idl, idlde, or idlhelp), the latest version will be
# run. All IDL_PATH entries which reference a preset $IDL_DIR will be
# updated. This will ensure the correct set of IDL libraries are
# being run.
# The user need no longer set IDL_DIR, it will be set by this script.
# It's not a problem if they do. The can also use IDL_EXTRA to
# specify other paths they'd like to search, which will be appended
# beyond the distributed IDL library's path. If they'd like to
# override the library, for instance, they can specify IDL_PATH
# directly, being sure to include $IDL_DIR/lib. This is less portable
# and not always a good idea, unless you really need to specify the
# ordering of the paths.
# N.B.: This all means a new user need set up *nothing* in their
# .cshrc, .login, etc., to run any version of IDL immediately, and
# should simply specify a colon-separated lists of paths in
# "IDL_EXTRA" for their local programs (with a + prefix for recursion,
# if desired).
# N.B.: THIS FILE GOES IN THE DIRECTORY LABELED "destdir" IN THE
# SCRIPT makelinks (see the RSI install directory),
# J.D. Smith 2000-11-5
# Set this to the RSI install base, as seen by the computer to run this script
rsi_base=/usr/local/rsi
base=$(dirname $0)
# Save the (possible) user-set idl dir
[ -n "$IDL_DIR" ] && old_dir=$IDL_DIR
# See how we were called.
vers=${0##*/}
case $vers in
*idlde*)
vers=${vers#idlde_};
prog="idlde";
;;
*idlhelp*)
vers=${vers#idlhelp_};
prog="idlhelp";
;;
*idl*)
vers=${vers#idl_};
prog="idl";
;;
*)
echo "Improperly formatted command name: $0";
exit 1;
;;
esac
# Only dots and numbers
vers=$(echo $vers | tr -cd '[0-9].')
# No version? No problem. Find the latest version.
[ -z "$vers" ] && {
latest="0.0"
for scr in $base/idl_*; do
[ -L $scr ] || continue # Only links please
dvers=${scr##*/}
dvers=${dvers#idl_}
# Only dots and numbers, we need to compare
dvers=$(echo $dvers | tr -cd '[0-9].')
[ -z "$dvers" ] && continue
major=${dvers%%.*}
minor=${dvers#*.}
minor=$(echo $minor | tr -d '.')
fvers="$major.$minor"
[ -n $(echo "if (${fvers}>${latest}) 1" | bc) ] && {
vers=$dvers;
latest=$fvers;
}
done
}
[ -z "$vers" ] && {
echo "Cannot find any validly named version of idl in $base." 1>&2;
exit 1;
}
export IDL_DIR="$rsi_base/idl_$vers"
# Update any relevant parts of the IDL_PATH to point to the new directory
if [ -n "$old_dir" -a -n "$IDL_PATH" ]; then
export IDL_PATH=$(echo $IDL_PATH | sed "s:$old_dir:$IDL_DIR:g")
fi
# If there wasn't one, make sure the lib directory is included
[ -z "$IDL_PATH" ] && export IDL_PATH="+$IDL_DIR/lib${IDL_EXTRA:+:$IDL_EXTRA}"
# Run the correct version
exec $IDL_DIR/bin/$prog $@
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