There are 3 ways to create the symbolic links or define
the environment variables necessary to run IDL:

1) Allow this script to install IDL in the ITT VIS recommended
manner:

- If the itt directory tree (of which IDL is a
subdirectory) is not located in /usr/local/itt,
create a symbolic link called /usr/local/itt that points
at it.

- Create symbolic links in /usr/local/bin for IDL and
related commands. To run IDL, users must put
/usr/local/bin in their execution paths. At most sites,
this is already the case.

2) You can manually create the symbolic links using the commands:

setenv ITT /afs/slac/g/glast/users/chuckp/itt

ln -s $ITT /usr/local/itt
ln -s $ITT/idl71/bin/idl LOCAL_DIR/idl71
ln -s $ITT/idl/bin/idl LOCAL_DIR/idl

ln -s $ITT/idl71/bin/idlde LOCAL_DIR/idlde71
ln -s $ITT/idl/bin/idlde LOCAL_DIR/idlde

ln -s $ITT/idl71/bin/idlrpc LOCAL_DIR/idlrpc71
ln -s $ITT/idl/bin/idlrpc LOCAL_DIR/idlrpc

ln -s $ITT/idl71/bin/idlhelp LOCAL_DIR/idlhelp71
ln -s $ITT/idl/bin/idlhelp LOCAL_DIR/idlhelp

ln -s $ITT/idl71/bin/idlman LOCAL_DIR/idlman71
ln -s $ITT/idl/bin/idlman LOCAL_DIR/idlman

ln -s $ITT/idl71/bin/idldemo LOCAL_DIR/idldemo71
ln -s $ITT/idl/bin/idldemo LOCAL_DIR/idldemo

ln -s $ITT/idl71/bin/ittlicense LOCAL_DIR/ittlicense71
ln -s $ITT/idl/bin/ittlicense LOCAL_DIR/ittlicense

where LOCAL_DIR is the path of a directory on your system
that commonly appears in users' paths.

3) Files named idl_setup and idl_setup.ksh are
automatically created by the installation script. These
files contain appropriate definitions for IDL-related
environment variables and aliases. If you choose this
option, you must have your users set up their accounts
as shown below:

Have your C-shell users add the line:

source /afs/slac/g/glast/users/yourDirectory/itt/idl/bin/idl_setup

to their .cshrc files.

Have your Korn shell users add the line:

. /afs/slac/g/glast/users/yourDirectory/itt/idl/bin/idl_setup.ksh

to their .profile files.

Have your Bash shell users add the line:

. /afs/slac/g/glast/users/yourDirectory/itt/idl/bin/idl_setup.bash

to their .bashrc files.