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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@133 a672b425-5310-4d7a-af5c-997e18724b81
49 lines
1.5 KiB
HTML
49 lines
1.5 KiB
HTML
---
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layout: page
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category_title: Intermediate commands
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category-page: intermediate
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author: Marco Farace
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title: Who/WhoamI
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---
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<h2>Use: display a list of all logged in users/display info about current user</h2>
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<p>The who utility displays a list of all users currently logged on, showing
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for each user the login name, tty name, the date and time of login, and
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hostname if not local. </p>
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<p>
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Here are just some of the most useful options for this command:
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<ul>
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<li>-b</li><br> Display time of last system boot.
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<li> -d</li><br> Print dead processes.
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<li>-H</li><br> Write column headings above the regular output.
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<li>-m</li><br> Only print information about the current terminal. This is the
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POSIX way of saying who am i.
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<li>-q</li><br> ``Quick mode'': List only the names and the number of users cur-
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rently logged on. When this option is used, all other options are
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ignored.
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<li>-s</li><br> List only the name, line and time fields. This is the default.
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<li>-T</li><br> Print a character after the user name indicating the state of the
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terminal line: `+' if the terminal is writable; `-' if it is not;
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and `?' if a bad line is encountered.
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<li>-u</li><br> Print the idle time for each user, and the associated process ID.
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<li>am I</li><br> Returns the invoker's real user name.
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<li>file</li><br> By default, who gathers information from the file /var/run/utmpx.
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An alternative file may be specified.
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<ul>
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</p>
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