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I keep forgetting this:
If you're coming across an old *nix box that you haven't used in a while and want to bring up all the users on the system, run this command:

awk -F':' '{ print $1}' /etc/passwd

Almost all *nix systems have awk available and /etc/passwd is the account login file (passwords themselves are usually stored /etc/shadow)

You can also just make yourself a shell script:

#!/bin/sh

awk -F':' '{ print $1}' /etc/passwd

exit
# End script