Who

'who' prints information about a users who are presently logged on. If given no non-option arguments,

'who' prints the subsequent information for every user which are presently logged on: login name, login time, terminal line and remote hostname or X display.  who command enables you to search out the users on the system.

Syntax

Options

who [OPTION]           [am i]

-H   - heading print line of column headings

-I     -            adds user idle time as HOURS: MINUTES or old

-q    - counts and prints only the login names and the number of users logged on.

Who am i

It displays the present username, date, terminal type, and login time

Practice 1

The given example displays the usage of who command.

# who

root      pts/0    May     15        13:37

sunil     pts/1    May     15        16:44

ajay      pts/2    May     15        17:12

oracle   pts/3    May     15        17:12

The above instance displays the list of users' information.