That is not always going to work. If I remember correctly if you run under mod_perl, you start with an extremely limited environment, such as: 
MOD_PERL = mod_perl/2.0.1
MOD_PERL_API_VERSION = 2
PATH = X:\webserver\perl\bin\;C:\WIN ...

[download]
and that's it.

Checking the environment is probably not very portable either.

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law

In reply to Re^3: Telling if your script is running from web page or CLI by CountZero
in thread Telling if your script is running from web page or CLI by dizzyg

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