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How to use the pidof and pgrep commands: 2-Minute Linux Tip

Network World | Dec 18, 2020

In this Linux tip, learn how to use the pidof and pgrep commands. Both help you to find the process IDs (PIDs) of running processes. All you have to do is enter the command followed by the name of the process you're interested in.

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Hi, this is Sandra Henry-Stocker, author of the “Unix as a Second Language” blog on NetworkWorld.
In this Linux tip, we’re going to look at the pidof and pgrep commands. Both help you to find the process IDs (PIDs) of running processes. All you have to do is enter the command followed by the name of the process you're interested in.
For example, with pidof you can ask about systemd processes like this:
As you see, pidof found three systemd processes running on the system.
If you use pgrep instead of pidof, the list will also include processes that contain the specified string as part of the process name – so there are more of them. It also lists them in a vertical format and in numerical order.
The additional process IDs in this list are systemd-logind and other processes that are related to systemd, but have longer names.
That’s your Linux tip for pidof and pgrep.
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