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adduser and deluser,
respectively.
To add a user funky to the system, use the following command:
adduser funky
The command prompts for additional information about the user, as well as an initial password.
The adduser command accomplishes several tasks. First, it adds an
entry to the password file in the system. Next, it creates a skeletal
``home directory'' for the user. By default, Debian Linux set up a user
home directory so that only the owner has access to its content. However,
this may not be true for other distributions.
To remove a user, the Debian Linux command is deluser. For example,
to delete the user funky, we can use the following command:
deluser funky
Note that the deluser command does not automatically erase
the home directory of the delete user. Instead, it simply removes the
user's entry from the main password file. This means the a deleted user
cannot log into the system anymore. You can, however, supply additional
options to erase the home directory of a user.