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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@254 a672b425-5310-4d7a-af5c-997e18724b81
39 lines
1.5 KiB
HTML
39 lines
1.5 KiB
HTML
---
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layout: page
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category-page: intermediate
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category-title: Intermediate commands
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author: Marco Farace
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title: who
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previous-page: pages/cmd/interm/watch.html
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---
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The <code>who</code> command displays a list of all logged in users/display info
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about current user
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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.<br>
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<h3>Flags</h3>
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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: Display time of last system boot.</li>
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<li> -d: Print dead processes.</li>
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<li>-H: Write column headings above the regular output.</li>
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<li>-m: Only print information about the current terminal.</li>
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<li>-q: <i>Quick mode</i>: List only the names and the number of users currently logged on.
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When this option is used, all other options are
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ignored.
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</li>
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<li>-s: List only the name, line and time fields. This is the default.</li>
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<li>-T: 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>
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<li>-u: Print the idle time for each user, and the associated process ID.</li>
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<li>am I: Returns the invoker's real user name. You can also use <code>whoami</code></li>
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<li>file: 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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</li>
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</ul>
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