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I have a script that is littered around my filesystem (side effect of a build process) that sets some global environment variables (LD_LIBRARY_PATH, PATH, ROOTDIR, etc) that need to be in my shell for proper operation. Of course, that means I need to source script.sh or . script.sh to get it to work, and not ./script.sh (which would spawn a new shell and not set the variables in my current shell).

Is there anything I can add to the script to prevent (or warn) someone running ./script.sh ?

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1 Answer 1

up vote 3 down vote accepted

In a shell script, $0 is the name of the currently running script. You can use this to tell if you're being sourced or run like this:

if [[ "$(basename -- "$0")" == "script.sh" ]]; then
    echo "Don't run $0, source it" >&2
    exit 1
fi
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I needed to add a X prefix, i.e. [[ "$(basename "X$0")" == "script.sh" ]], otherwise $0 expanded to -bash when sourced which was a syntax error. –  thebjorn Nov 18 at 11:34
    
Indeed, thanks. I fixed it by adding '--'. –  Mikel Nov 18 at 16:51
    
That makes more sense (I always forget about the --..) –  thebjorn Nov 18 at 18:32

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