TranslateProject/sources/tech/20160801 Linux how long a process has been running.md

MikeCoder translating...

Linux how long a process has been running

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:

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 译者：译者ID 校对：校对者ID

本文由 LCTT 原创编译，Linux中国 荣誉推出