How do I get `__FILE__` when sourcing a csh script

Question

I have a script that is used to set some env vars in the calling csh shell. Some of those variables depend on the location of the script.

If the file is a proper csh script, I can use $0 to access __FILE__ but if I run the script using source, it just tells me csh or tcsh.

Since I'm using this to set vars in the parent shell, I have to use source.

What to do?

Answer 1

If you access $_ on the first line of the file, it will contain the name of the file if it's sourced. If it's run directly then $0 will contain the name.

#!/bin/tcsh
set called=($_)
if ($called[2] != "") echo "Sourced: $called[2]"
if ($0 != "tcsh") echo "Called: $0"

Answer 2

This is hard to read, but is actually works:

If your script is named test.csh

/usr/sbin/lsof +p $$ | \grep -oE /.\*test.csh