$ ps -ef | grep containerd
root      8723  8715  0 12:26 ?        00:00:01 containerd
If there have many commands with name containerd, the result may let some annoyance.
If you want to know the full path of the process, can do this:
$ ls -al /proc/8723/exe 
lrwxrwxrwx 1 root root 0 Feb 14 12:26 /proc/8723/exe -> /usr/local/bin/containerd
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