An effective solution doesn't necessarily mean Perl in this case.
PATH is most likely set, assuming you're using bash by the file .bash_profile for login shells or by .bashrc for non-login shells in your home directory.
By the description I was assuming that you were interested in setting the PATH for your shell use.
From perldoc perlvar:
"$ENV{expr} -
The hash %ENV contains your current environment. Setting a value in "ENV" changes the environment for any child processes you subsequently fork() off."
This means a script cannot modify the ENV for it's parent shell, only for it's children processes. A shell is a script's parent process.
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