Setting #! path using environment

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

I have a bunch (20+) of perl scripts that i use on both a development and production environment which have different perl paths. My question is this... is it possible to set the #! line using the environment? So something like this:

#!${DEV_PERL_PATH}

or am i barking up the wrong tree?

Thanks

Joe

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Eschew obfuscation, espouse elucidation!

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Re: Setting #! path using environment by moritz (Cardinal) on Jul 01, 2009 at 09:08 UTC
You can use `#!/usr/bin/env perl` [download] and manipulate your `PATH` environment variable so that the first perl found in PATH is the one you want your scripts to use.	[reply] [d/l] [select]
Re: Setting #! path using environment by JavaFan (Canon) on Jul 01, 2009 at 10:42 UTC
You have to consider who is reading that line and acting upon it. The answer is: the kernel. And it's not emulating a shell or a program like perl. So it isn't looking for names of environment variables. So, you're barking up the wrong tree using this syntax. (But see the thread for alternative answers).	[reply]
Re: Setting #! path using environment by Anonymous Monk on Jul 01, 2009 at 10:33 UTC
Why not install the scripts? See http://search.cpan.org/dist/ppt/ as an example. use scriptdist to create a distribution for a perl script `# B/BD/BDFOY/scriptdist-0.15.tar.gz cpanp i bdfoy/scriptdist-0.15` [download] Read more about scriptdist here.	[reply] [d/l]
Re: Setting #! path using environment by afoken (Chancellor) on Jul 01, 2009 at 14:33 UTC
Use a symlink to perl on the one machine to simulate the other machine, or create a new directory on both machines and place the symlink there, pointing to the proper perl binary. Use the symlink in the #! line. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply]
Re: Setting #! path using environment by rovf (Priest) on Jul 01, 2009 at 11:47 UTC
You could write a helper program, say `dev_perl_exec` in C or a similar language, which runs $ENV{DEV_PERL_PATH} and passes its stdin to this program, and use it as `#!/.../dev_perl_exec` [download] So you basically would emulate the `/bin/env` trick, but not requiring that the "correct" Perl is in the PATH. -- Ronald Fischer <ynnor@mm.st>	[reply] [d/l] [select]
Re: Setting #! path using environment by mzedeler (Pilgrim) on Jul 01, 2009 at 11:02 UTC
If you're on linux or the like, the `env` command should be able to do the trick.	[reply] [d/l]