hi i have some perl scripts with shebang line as (#! /usr/bin/env perl ) instead of actual absolute path of perl ( i know why its that way ) everything works fine from command line , the problem is when i am trying to run those scripts from web ( local web tool ) it throws error as

/usr/bin/env : perl No such file or directory

What is env? What you have is a shebang where perl is some kind of parameter or option. I'm guessing you find perl because it is in your PATH when you are logged on. a more standard shebang would be

/usr/bin/env/perl

It because the perl interpreter is not in the search path of the user that owns the web server process.
You could consider:

1. Modifying your shebang (to point directly to the perl interpreter), for example:

#!/usr/bin/perl

#!/usr/bin/env perl

yup you are right...
PATH variable was not passed to fastcgi when starting a apache as it was not in path it used to throw error. just passed the variables now its working ..
thanks a lot

I would like to "dig" the subject a little bit more, because I have also problem with script using that way of shebang.
I have installed, on Solaris, system wide, Perl 5.8.7 and the script that uses env tool to launch perl interpreter looks for LibXML.pm in folders where used to be installed perl 5.8.4.
So i have two questions:
1. why one would use env tool to launch perl instead of launching perl directly?
2. how to modify the env's output?

You could need to call it that way when you don't have control over the owner of the apache process and/or
you want to use the same configuration file on more non identical systems.

If the above is not true just modify the environment of the owner of the apache process and point directly to the desired Perl interpreter.

You will use /usr/bin/env ... when you are not sure where exactly the needed executable is located, but you're sure it can be found somewhere in the environment.

Hi.

These are good questions, and it is useful to know the issues. As radoulov has written, the env in the shebang line

#!/usr/bin/env bash

#!/bin/bash -