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Sudo is not the only game in town of course. I won't comment on some of the other options as I haven't spent much time working with them (and I'd probably be a bit biased). If you would like to add to this list, please send mail to sudo@sudo.ws.

Below is a list of free sudo-like utilities that I am aware of:

• sus

• super

• runas, part of Titan

• Erni, a derivative of runas

• priv

• calife

• osh

• ssu

• su1

• op (originally shipped with ConvexOS, this is a free version based on Tom Christiansen's paper)
• calife

• The AIX sysctl command has sudo-like properties.

• SCO OpenServer used to ship with a command call asroot but it has been removed from the current version.
• HP-UX has a resticted verson of the SAM system administration tool that allows non-root users to perform specific tasks.

Additionally, I know of the following commercial packages:

• suSub

• Power Broker

• CaclMgr

• UNIX Privilege Manager