I think sudo sets some environment variables that you can check for in your perl script...

From the sudo manpage: 

SUDO_USER              Set to the login of the user who invoked sudo
SUDO_UID               Set to the uid of the user who invoked sudo
SUDO_GID               Set to the gid of the user who invoked sudo

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-Blake

In reply to Re: Logging script usage when executed via sudo on *nix by blakem
in thread Logging script usage when executed via sudo on *nix by c

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