Linux pgrep Guide

Linux pgrep Guide

Complete beginner-friendly guide to pgrep on Linux, covering Arch Linux, CachyOS, and other distributions including finding processes by name, pattern matching, and process searching.

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Table of Contents

1. Understanding pgrep
2. pgrep Basics
3. Pattern Matching
4. Process Information
5. Troubleshooting

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Understanding pgrep

What is pgrep?

pgrep finds processes by name.

Uses:

• Find processes: Search for processes
• Pattern matching: Match process names
• Process search: Search running processes
• PID lookup: Get process IDs

Why it matters:

• Process finding: Find processes easily
• Pattern matching: Match multiple processes
• Process management: Manage processes

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pgrep Basics

Find Process

Basic usage:

# Find process by name
pgrep process-name

# Returns PIDs

List Names

Show names:

# Show process names
pgrep -l process-name

# -l = list (shows name and PID)

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Pattern Matching

Full Command Line

Match full command:

# Match full command line
pgrep -f "pattern"

# -f = full command line

Exact Match

Exact name:

# Exact match
pgrep -x process-name

# -x = exact match

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Process Information

Count Processes

Count matches:

# Count processes
pgrep -c process-name

# -c = count (number of matches)

User Filter

Filter by user:

# Processes by user
pgrep -u username process-name

# -u = user

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Troubleshooting

No Processes Found

Check pattern:

# Verify pattern
ps aux | grep process-name

# Check if process exists

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Summary

This guide covered pgrep usage, process searching, and pattern matching for Arch Linux, CachyOS, and other distributions.

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Next Steps

• pkill Guide - Kill by name
• ps Guide - Process listing
• Process Management - Process management
• pgrep Documentation: man pgrep

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This guide covers Arch Linux, CachyOS, and other Linux distributions. For distribution-specific details, refer to your distribution's documentation.