How can I find the location of the tcsh shell script I'm executing?

In c shell, try like this:

set rootdir = `dirname $0`
set abs_rootdir = `cd $rootdir && pwd`
echo $abs_rootdir

If you want to ensure the same result (full path and script name) try something like this:

...
rootdir=`/bin/dirname $0`       # may be relative path
rootdir=`cd $rootdir && pwd`    # ensure absolute path
zero=$rootdir/`/bin/basename $0`
echo $zero
...

Then you can call it as foo.sh, ./foo.sh, some/lower/dir/foo.sh and still get the same result no matter how it is called.

If you want an absolute path then this should help you out:

#!/bin/tcsh -f 
set called=($_)

if ( "$called" != "" ) then  ### called by source 
   echo "branch 1"
   set script_fn=`readlink -f $called[2]`
else                         ### called by direct execution of the script
   echo "branch 2"
   set script_fn=`readlink -f $0`
endif

echo "A:$0"
echo "B:$called"
set script_dir=`dirname $script_fn`

echo "script file name=$script_fn"
echo "script dir=$script_dir"

Source: http://tipsarea.com/2013/04/11/how-to-get-the-script-path-name-in-cshtcsh/