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shebang: automagically obtaining

by nutshell (Beadle)
on Oct 05, 2002 at 02:12 UTC ( #202970=perlquestion: print w/replies, xml ) Need Help??

nutshell has asked for the wisdom of the Perl Monks concerning the following question:

Is there a cross-platform method of obtaining the shebang line automagically?

--nutshell

Replies are listed 'Best First'.
Re: shebang: automagically obtaining
by kelan (Deacon) on Oct 05, 2002 at 04:44 UTC
Re: shebang: automagically obtaining
by Anonymous Monk on Oct 05, 2002 at 04:32 UTC
    probably not completely cross-platform. you could take a look at this recent node
Re: shebang: automagically obtaining
by IndyZ (Friar) on Oct 05, 2002 at 02:31 UTC
    Just to be clear... Do you want to find the shebang line of your script, or do you want to automatically add the appropriate shebang line to a script that presumably doesn't have one?

    --
    IndyZ
      Trying to get the script to automagically detect it.

      This magical line would replace the #! thing.

      --nutshell

        I interpret this as meaning, "My script needs to generate it's own shebang line, i.e., it needs to self-modify after it has been loaded by the interpreter." If this is the case, then you are missing the point of the shebang line. It tells the system what interpreter to use when executing a file, whether it is a shell script, Perl script, or Ruby program. Because of this, the shebang must exist before the script is run. Otherwise, the system won't know what interpreter to use and will cough up the error that you saw when you tried BUU's suggestion.

        But, if you could tell us why you need to do something like this, we might be able to offer an alternative solution.

        --
        IndyZ

Re: shebang: automagically obtaining
by BUU (Prior) on Oct 05, 2002 at 02:18 UTC
    open me,$0 or die $!; print $shebang=<me>;
      "File is not executable; ensure interpreted scripts have '#!' first line"

      --nutshell

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