pkill Command Examples in Linux¶

Introduction¶

These examples show practical ways to use pkill on a Linux terminal. Each example is written so you can adapt it for administration or troubleshooting.

Example 1: Basic Usage¶

pkill firefox

This is the simplest form of the command and is a good starting point before adding options.

Example 2: Common Admin Task¶

sudo pkill -HUP rsyslogd

This example reflects a common task on RHEL, Rocky Linux, AlmaLinux, or similar systems.

Example 3: Useful Option¶

pkill -u student

This option helps narrow the result, change behavior, or handle a more realistic target.

Example 4: Real-World Scenario¶

pkill -f "python app.py"

Use this pattern when the task moves beyond a single basic command.

Example 5: Verification¶

pgrep -a firefox

Example output:

2345 /usr/lib64/firefox/firefox
2351 /usr/lib64/firefox/firefox -contentproc

Common Mistakes¶

• Using a broad pattern that matches unrelated processes.
• Using -f without previewing with pgrep.
• Forgetting that pkill may affect multiple processes at once.

Quick Reference¶

pkill firefox
sudo pkill -HUP rsyslogd
pkill -u student
pkill -f "python app.py"
pgrep -a firefox

Related Guides¶

• What is pkill?
• pkill vs kill explained
• pkill by User and Pattern
• pkill interview questions

Summary¶

Good pkill usage means choosing the right option, keeping the target clear, and verifying the result with output you can explain.