Perl script as the shebang?

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

Replies are listed 'Best First'.
Re: Perl script as the shebang? by ambrus (Abbot) on Sep 18, 2004 at 11:43 UTC
I think `#!/usr/bin/perl /usr/bin/perl/myscript.pl` is not ugly. The other way is to create a small C program that does nothing but execs perl to run that script. Than you can put the name of that binary in the shebang line. Yet another way is to use a bash or perl script like `#!/usr/bin/perl -w ARGV = DATA{IO}; do "/usr/bin/perl/myscript.pl"; __DATA__` [download] or a shell script like this: `#!/bin/sh perl /usr/bin/perl/myscript.pl "$0"; exit 0` [download] and make perl script the first lines, or just `#!/bin/sh perl /usr/bin/perl/myscript <<ENDDATA; exit 0` [download] if you don't need to seek in the file.	[reply] [d/l] [select]
Re: Perl script as the shebang? by ikegami (Patriarch) on Sep 18, 2004 at 07:30 UTC
The shebang says to which executable to feed the script, so for a perl script, it's simply: `#!/usr/bin/perl` [download] You can add options if you like: `#!/usr/bin/perl -w` [download] If you're trying to feed another script to your own script, you have to do `#!/usr/bin/perl /usr/bin/perl/myscript.pl` instead of `#!/usr/bin/perl/myscript.pl` because myscript.pl is not an executable.	[reply] [d/l] [select]
Re: Perl script as the shebang? by perrin (Chancellor) on Sep 18, 2004 at 22:23 UTC
It's called HashBang.	[reply]
Re: Perl script as the shebang? by Aristotle (Chancellor) on Sep 18, 2004 at 20:59 UTC
You can't invoke scripts directly from the shebang line, so you'll need that workaround. You can at least make it language agnostic though: `#!/usr/bin/env /usr/bin/perl/myscript.pl` [download] Makeshifts last the longest.	[reply] [d/l]
Re: Perl script as the shebang? by meredith (Friar) on Sep 18, 2004 at 20:38 UTC
What about: `#!/bin/bash /usr/bin/perl /usr/bin/myscript.pl <<END whatever you wanted to feed to your script blah foo bar END` [download] I think that would be clearer to more people looking at the file. Update: Oops! Didn't notice that this was already covered. `mhoward - at - hattmoward.org`	[reply] [d/l]
Re: Perl script as the shebang? by rjbs (Pilgrim) on Sep 19, 2004 at 01:16 UTC
While other suggestions are, in my opinion, better, you will find that zsh will allow you to put shebang-powered scripts in the shebang line. The kernel execve call will fail, but zsh will pick up the pieces. Just another reason that zsh is the bee's knees! rjbs	[reply]
Re^2: Perl script as the shebang? by Aristotle (Chancellor) on Sep 19, 2004 at 07:28 UTC
But that will work only from within zsh. If you want to run such a script from somewhere else (like as a CGI script, or maybe during the init scripts which are usually executed by a more lightweight sh), you still need one of the other solutions. Makeshifts last the longest.	[reply]