What do you get for 

$ ls -l /opt/perl/bin/perl

$ which -a perl

[download]

The shell's search behavior (mimicked by which) is to skip programs if their binary isn't executable for the user in question, even if it comes earlier in $PATH.

P.S.: it's usually not a good idea to make directories like /opt/perl world-writable...

In reply to Re: Permissions for a separately installed perl by almut
in thread Permissions for a separately installed perl by wfsp

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