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    #!/usr/bin/env python vs. #!/usr/bin/python


    I am new to python but have writing perl and shell scripts for a long time now. I have always used these shebangs

    !#/bin/sh
    !#/usr/bin/perl

    so when I started writing Python it was just natural to do

    #!/usr/bin/python

    Is there any reason why I should switch?
    Does it really matter?

    Thanks
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    Devshed Intermediate (1500 - 1999 posts)

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    If you use #!/usr/bin/python you are assuming that python is always installed in the /usr/bin directory - on some version of unix/linux it is installed elsewhere.

    If you use #!/usr/bin/env python then it should run it wherever it is on the path. This should make your script more portable.

    However for CGI scripts it is better to specify the full path to python, since the PATH variable may not be set for the CGI script.

    Dave - The Developers' Coach
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    #!/usr/bin/python only works with some Linux distros (RedHat). It doesn't work on my FreeBSD, NetBSD or OpenBSD boxes. For these boxes, python is installed elsewhere (/usr/local/bin or /usr/pkg/bin), since it doesn't come with these systems by default. #!/usr/bin/env python works everywhere. Incidentally, I borrowed that idea for my perl scripts too (since NetBSD doesn't have perl installed by default either)
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