If you want to be able to add several users at once, rather than having to enter each one individually, use the mass_useradd script. It’s a shell script, so it should run just about anywhere. You’ll also need mass_passwd. Store the two scripts in the same directory. You should also install the pwgen utility, for generating passwords. You’ll need a colon-delimited text list of logins and usernames in this format:

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If you need to delete a user, but userdel reports that some of the user’s processes are running. You sure would like single command to find and stop all of the user’s processes, use the slay program:

# slay foober
slay: -KILL is kicking foober’s butt!
slay: Whoa, I have the power supreme.

slay finds and kills all the user’s processes at once, saving you the trouble of hunting them down and killing them yourself. slay has four modes: nice, normal, mean, and butthead. Mean mode kills any nonprivileged user who attempts to slay another user. Set your desired mode in /etc/slay_mode.

The traditional method of finding processes belonging to a user is to use ps, as in:

$ ps U 1007

or:

$ ps U foober
3936 ? S 0:00 xchat
3987 ? S 0:00 /usr/lib/galeon-bin
4209 ? S 0:00 kdeinit: kio_file file /tmp/ksocket-carla/klauncherkF21rc.slave-

You can then kill one by one:

# kill 3936
# kill 3987
# kill 4209