The trick is to use the caller function. Example:

a.pl: unless (caller[0] =~ /main/) { print "a was called directly\n"; }
b.pl:do "a.pl";

Now, if a.pl is called directly, it will print the message, but if b.pl is called first, and a.pl is called from b.pl, it will not print the message.

In reply to Re: Detection of main script / libraries by shmuelp
in thread Detection of main script / libraries by Anonymous Monk

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