From f59107204f61e988f56e4e10517815585c6a4b8e Mon Sep 17 00:00:00 2001
From: Ezio <ezio_zhang@outlook.com>
Date: Fri, 19 Aug 2016 11:05:07 +0800
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+Linux how long a process has been running
+=====================
+
+![](http://s0.cyberciti.org/images/category/old/linux-logo.png)
+
+>I‘m a new Linux system user. How do I check how long a process or pid has been running on my Ubuntu Linux server?
+
+You need to use the ps command to see information about a selection of the active processes. The ps command provide following two formatting options:
+
+1. etime Display elapsed time since the process was started, in the form [[DD-]hh:]mm:ss.
+2. etimes Display elapsed time since the process was started, in seconds.
+
+### How to check how long a process has been running?
+
+You need to pass the -o etimes or -o etime to the ps command. The syntax is:
+
+```
+ps -p {PID-HERE} -o etime
+ps -p {PID-HERE} -o etimes
+```
+
+#### Step 1: Find PID of a process (say openvpn)
+
+```
+$ pidof openvpn
+6176
+```
+
+#### Step 2: How long a openvpn process has been running?
+
+```
+$ ps -p 6176 -o etime
+```
+
+OR
+
+```
+$ ps -p 6176 -o etimes
+```
+
+To hide header:
+
+```
+$ ps -p 6176 -o etime=
+$ ps -p 6176 -o etimes=
+```
+
+Sample outputs:
+
+![](http://s0.cyberciti.org/uploads/faq/2016/08/How-to-check-how-long-a-process-has-been-running.jpg)
+
+The 6176 is the PID of the process you want to check. In this case I’m looking into openvpn process. Feel free to replace openvpn and PID # 6176 as per your own requirements. In this find example, I am printing PID, command, elapsed time, user ID, and group ID:
+
+```
+$ ps -p 6176 -o pid,cmd,etime,uid,gid
+```
+
+Sample outputs:
+
+```
+  PID CMD                             ELAPSED   UID   GID
+ 6176 /usr/sbin/openvpn --daemon        15:25 65534 65534
+```
+ 
+--------------------------------------------------------------------------------
+
+via: http://www.cyberciti.biz/faq/how-to-check-how-long-a-process-has-been-running/
+
+作者：[VIVEK GITE][a]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: http://www.cyberciti.biz/faq/how-to-check-how-long-a-process-has-been-running/