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<h1>
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How to check Linux process information?
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</h1>
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<ol class="breadcrumb">
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<li>
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<time class="published" datetime="2018-08-17T11:14:00+02:00">
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17 août 2018
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</time>
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</li>
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<li>Linux</li>
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<li>Bash</li>
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<div class='article_content'>
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<h3>How to check Linux process information (CPU usage, memory, user information, etc.)?</h3>
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<p>You need to use the <code>ps</code> command combined with the <code>grep</code> command. In the example, we want to check the information on the nginx process :</p>
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<div class="highlight"><pre><span></span>ps aux <span class="p">|</span> grep nginx
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</pre></div>
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<p>It would return the output :</p>
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<div class="highlight"><pre><span></span>root 9976 0.0 0.0 12272 108 ? S<s Aug12 0:00 nginx: master process /usr/bin/nginx -g pid /run/nginx.pid; daemon on; master_process on;
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http 16780 0.0 0.0 12384 684 ? S< Aug12 4:11 nginx: worker process
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http 16781 0.0 0.0 12556 708 ? S< Aug12 0:24 nginx: worker process
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http 16782 0.0 0.1 12292 744 ? S< Aug12 2:43 nginx: worker process
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http 16783 0.0 0.1 12276 872 ? S< Aug12 0:24 nginx: worker process
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admin 17612 0.0 0.1 5120 864 pts/4 S+ 11:22 0:00 grep --color=auto nginx
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</pre></div>
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<p>The columns have the following order :
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USER;PID;%CPU;%MEM;VSZ;RSS;TTY;STAT;START;TIME;COMMAND</p>
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<ul>
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<li>USER = user owning the process</li>
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<li>PID = process ID of the process</li>
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<li>%CPU = It is the CPU time used divided by the time the process has been running.</li>
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<li>%MEM = ratio of the process’s resident set size to the physical memory on the machine</li>
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<li>VSZ = virtual memory usage of entire process (in KiB)</li>
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<li>RSS = resident set size, the non-swapped physical memory that a task has used (in KiB)</li>
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<li>TTY = controlling tty (terminal)</li>
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<li>STAT = multi-character process state</li>
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<li>START = starting time or date of the process</li>
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<li>TIME = cumulative CPU time</li>
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<li>COMMAND = command with all its arguments</li>
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</ul>
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<h3>Interactive display</h3>
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<p>If you want an interactive display showing in real time the statistics of the running process you can use the <code>top</code> command. If <code>htop</code> is available on you system, use this instead.</p>
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<h3>Find an error or bug? Have a suggestion?</h3>
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<p>Everything on this site is avaliable on GitHub. Head on over and <a href='https://github.com/redoules/redoules.github.io/issues/new'>submit an issue.</a> You can also message me directly by <a href='mailto:guillaume.redoules@gadz.org'>email</a>.</p>
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<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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<br/>
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Copyright © Guillaume Redoulès,
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<time datetime="2018">2018</time>.
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