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1.7.4 finger

Allows you to find out information about another computer user. Different systems may give different amounts of information through the finger command.

finger jeff
gives you information about anyone named Jeff on your system.
finger -m jsmith
gives you information about the user with the username jsmith.
gives you information about the user with the E-mail address
finger @ pulsar
gives information about users logged onto the pulsar computer on the system. This information may contain the username of each user logged into any window, the idle time for each window, and from which machine the user logged onto pulsar.
(where pulsar is a machine name) allows one to acquire slightly more information about jsmith on a specific machine, pulsar. Sometimes one may only be able to finger someone in a different department by using the machine name in the command.