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53 lines
1.4 KiB
Markdown
53 lines
1.4 KiB
Markdown
# Find how long a process has run in UNIX
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UNIX and Linux have commands for almost everything; if there is no command, you can check some important files in the `/etc` directory or in the `/proc` virtual filesystem to find out some useful information.
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## Table of contents <!-- omit in toc -->
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1. [The easy way](#the-easy-way)
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1. [The hackish way](#the-hackish-way)
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1. [Sources](#sources)
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## The easy way
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If the program started today, `ps` also shows when:
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```sh
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$ ps -ef
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UID PID PPID C STIME TTY TIME CMD
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user 11610 11578 0 Aug24 ? 00:08:06 java -Djava.library.path=/usr/lib/jni:/usr/lib/alpha-linux-gnu/jni...
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user 17057 25803 0 13:01 ? 00:00:24 /usr/lib/chromium-browser/chromium-browser
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```
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## The hackish way
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Useful if the process started before today:
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1. find the process ID
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```sh
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$ ps -ef | grep java
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user 22031 22029 0 Jan 29 ? 24:53 java -Xms512M -Xmx512 Server
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$ pgrep -l java
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22031 java
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```
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1. look into the `proc` virtual filesystem for that process and check the creation date, which is when the process was started
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```sh
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ls -ld /proc/22031
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dr-x--x--x 5 user group 832 Jan 22 13:09 /proc/22031
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```
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## Sources
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- [How to find how long a process has run in Unix]
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<!--
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References
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-->
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<!-- Others -->
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[how to find how long a process has run in unix]: https://dzone.com/articles/how-to-find-how-long-a-process-has-run-in-unix
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