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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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tags: who user list log
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author: Marco Farace
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title: Who/WhoamI
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---
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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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<h3> Flags </h3>
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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. This is the
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POSIX way of saying who am i.</li>
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<li>-q: ``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.</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.</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.</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.</li>
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</ul>
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@ -23,6 +23,7 @@ similar functions.</p>
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<p>Where <code>[flags]</code> are the tee flags (below you will find more info),
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<p>Where <code>[flags]</code> are the tee flags (below you will find more info),
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and argument <code>[file]</code> is a file or a list of files, each of which
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and argument <code>[file]</code> is a file or a list of files, each of which
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receives the output.</p>
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receives the output.</p>
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<br>
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<h3>Flags:</h3>
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<h3>Flags:</h3>
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@ -31,6 +32,7 @@ receives the output.</p>
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<li><code>-a</code> Appends the output to each file, rather than overwriting it.</li>
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<li><code>-a</code> Appends the output to each file, rather than overwriting it.</li>
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<li><code>-i</code> Ignores interrupt signals.</li>
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<li><code>-i</code> Ignores interrupt signals.</li>
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</ul>
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</ul>
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<br>
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<h3>Example:</h3>
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<h3>Example:</h3>
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