coreutils: The who command
The ‘who’ Command
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The first program is the ‘who’ command. By itself, it generates a list
of the users who are currently logged in. Although I’m writing this on
a single-user system, we’ll pretend that several people are logged in:
$ who
⊣ arnold console Jan 22 19:57
⊣ miriam ttyp0 Jan 23 14:19(:0.0)
⊣ bill ttyp1 Jan 21 09:32(:0.0)
⊣ arnold ttyp2 Jan 23 20:48(:0.0)
Here, the ‘$’ is the usual shell prompt, at which I typed ‘who’.
There are three people logged in, and I am logged in twice. On
traditional Unix systems, user names are never more than eight
characters long. This little bit of trivia will be useful later. The
output of ‘who’ is nice, but the data is not all that exciting.
Info Catalog
coreutils: I/O redirection
coreutils: Opening the software toolbox
coreutils: The cut command