3

This is the list of my processes:

$ ps
PID   USER     TIME  COMMAND
    1 root      0:00 bash -c cp -R /docker /var/lib; echo Loading...; wrapdocker
    7 root      0:00 bash --login
  312 root      0:00 dockerd
  321 root      0:00 containerd --config /var/run/docker/containerd/containerd.toml --log-level info
  488 root      0:00 ps

I want to check if the process dockerd is running.
When I run: ps | grep dockerd it prints two processes:

$ ps | grep 'dockerd'
  312 root      0:00 dockerd
  492 root      0:00 grep dockerd  

I need to find it by the specific command line which is dockerd and not grep dockerd.

I need it as part of a shell script to check if dockerd is running.

2 Answers 2

6

You should use pgrep process instead of ps aux | grep process.

Like, currently gnome-terminal is running, so

ps aux | grep gnome-terminal
user    2045  0.9  0.9 459456 36084 ?        Ssl  17:33   0:00 
/usr/lib/gnome-terminal/gnome-terminal-server
user    2206  0.0  0.0  12780   996 pts/0    S+   17:33   0:00 grep 
gnome-terminal

Where as

pgrep gnome-terminal
2045

And currently chome is not running, so

ps aux | grep chrome
user    2212  0.0  0.0  12780   976 pts/0    S+   17:34   0:00 grep chrome

But pgrep chrome will return nothing.

In your case, pgrep dockerd will work.

1
  • 3
    pgrep matches on the process name unless you pass -f while ps aux shows the process arg lists. pgrep does an extended regexp match so pgrep -f gnome-terminal would still match on a process that runs grep gnome-terminal. Here you'd need pgrep -fx /usr/lib/gnome-terminal/gnome-terminal-server to only match on processes whose full arg list is /usr/lib/gnome-terminal/gnome-terminal-server Apr 1, 2019 at 12:18
0
#!/bin/bash

ps -ef | grep -q "[d]ockerd"
if [ "$?" -eq "0" ]
then
      echo "dockerd is running"
else
      echo "dockerd is not running"
fi
1
  • 1
    That still matches on any process that has dockerd in its arg list or is running as the dockerd user Apr 1, 2019 at 12:19

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