Linux rev Guide

Complete beginner-friendly guide to rev on Linux, covering Arch Linux, CachyOS, and other distributions including reversing characters, line reversal, and character order reversal.

---

Table of Contents

1. rev Basics
2. Character Reversal
3. Line Reversal
4. File Processing
5. Troubleshooting

---

rev Basics

Reverse Characters

Basic usage:

# Reverse characters
rev file.txt

# Reverses characters in each line

From Input

Pipe input:

# Reverse from input
echo "Hello" | rev

# Output: olleH

---

Character Reversal

Line by Line

Per line:

# Reverse each line
rev file.txt

# Reverses characters in each line

Example

Example output:

# Input: "Hello World"
# Output: "dlroW olleH"

---

Line Reversal

All Lines

All lines:

# Reverse all lines
rev file.txt

# Reverses characters in every line

Specific Lines

Filter lines:

# Specific lines
head -5 file.txt | rev

# Reverses first 5 lines

---

File Processing

Multiple Files

Multiple files:

# Multiple files
rev file1.txt file2.txt

# Reverses each file

Save Output

Save to file:

# Save output
rev file.txt > reversed.txt

# Saves reversed output

---

Troubleshooting

rev Not Found

Check installation:

# rev is part of util-linux
# Usually pre-installed

# Check rev
which rev

---

Summary

This guide covered rev usage, character reversal, and line reversal for Arch Linux, CachyOS, and other distributions.

---

Next Steps

• tac Guide - Reverse line order
• cat Guide - Display files
• Text Processing - Text manipulation
• rev Documentation: man rev

---

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