---
layout: page
category_title: Intermediate commands
category-page: intermediate
tags: who user list log
author: Marco Farace
title: Who/WhoamI
---

<p>The who utility displays a list of all users currently logged on, showing
  for each user the login name, tty name, the date and time of login, and
  hostname if not local. </p>

    <h3> Flags </h3>
    <ul>
      <li>-b: Display time of last system boot.</li>
      <li>-d: Print dead processes.</li>
      <li>-H: Write column headings above the regular output.</li>
      <li>-m: Only print information about the current terminal.  This is the
           POSIX way of saying who am i.</li>
      <li>-q: ``Quick mode'': List only the names and the number of users cur-
          rently logged on.  When this option is used, all other options are
          ignored.</li>
      <li>-s: List only the name, line and time fields.  This is the default.</li>
      <li>-T: Print a character after the user name indicating the state of the
           terminal line: `+' if the terminal is writable; `-' if it is not;
           and `?' if a bad line is encountered.</li>
      <li>-u: Print the idle time for each user, and the associated process ID.</li>
      <li>am I: Returns the invoker's real user name.</li>
      <li>file: By default, who gathers information from the file /var/run/utmpx.
          An alternative file may be specified.</li>
    </ul>