How to Find a Process by Name in Linux Quickly

To find a process by name in Linux, use the pgrep command followed by the process name, like pgrep firefox. Alternatively, use ps aux | grep process_name to list details of matching processes.

Syntax

Here are common commands to find a process by name:

• pgrep process_name: Lists process IDs matching the name.
• pidof process_name: Shows the process ID(s) of the named program.
• ps aux | grep process_name: Lists detailed info of processes matching the name.

Each command helps you identify running processes by their names.

bash

pgrep process_name
pidof process_name
ps aux | grep process_name

Example

This example shows how to find the process ID of the sshd service using pgrep and ps commands.

bash

pgrep sshd
ps aux | grep sshd

Output

1234
root      1234  0.0  0.1  123456  2345 ?        Ss   10:00   0:00 /usr/sbin/sshd -D
user      5678  0.0  0.0  23456   789 pts/0    S+   10:05   0:00 grep --color=auto sshd

Common Pitfalls

Common mistakes when searching for processes by name include:

• Using grep without excluding the grep process itself, which shows the grep command in results.
• Not using exact process names, causing multiple unrelated matches.
• Running commands without proper permissions, missing some processes.

Use pgrep for cleaner results and add | grep -v grep when using ps aux | grep.

bash

ps aux | grep sshd
ps aux | grep sshd | grep -v grep

Output

user      5678  0.0  0.0  23456   789 pts/0    S+   10:05   0:00 grep --color=auto sshd
root      1234  0.0  0.1  123456  2345 ?        Ss   10:00   0:00 /usr/sbin/sshd -D

Quick Reference

Command	Description	Example
pgrep process_name	Lists process IDs matching the name	pgrep sshd
pidof process_name	Shows process IDs of the named program	pidof sshd
ps aux | grep process_name	Lists detailed info of matching processes	ps aux | grep sshd
ps aux | grep process_name | grep -v grep	Excludes the grep command itself from results	ps aux | grep sshd | grep -v grep

Key Takeaways

Use pgrep for a simple and clean way to find process IDs by name.

The ps aux | grep process_name command shows detailed info but may include the grep process itself.

Add | grep -v grep to exclude the grep command from results when using ps and grep.

Use exact process names to avoid unrelated matches.

Run commands with appropriate permissions to see all processes.