Linux true and false Guide

Complete beginner-friendly guide to true and false on Linux, covering Arch Linux, CachyOS, and other distributions including boolean commands, exit codes, and script logic.

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Table of Contents

1. true and false Basics
2. Exit Codes
3. Script Usage
4. Conditional Logic
5. Troubleshooting

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true and false Basics

true Command

Basic usage:

# true always succeeds
true

# Exit code: 0 (success)

false Command

Basic usage:

# false always fails
false

# Exit code: 1 (failure)

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Exit Codes

Check Exit Code

Verify exit code:

# Check exit code
true
echo $?

# Output: 0 (success)

false
echo $?

# Output: 1 (failure)

Use in Conditions

Conditional logic:

# In if statement
if true; then
    echo "This runs"
fi

if false; then
    echo "This doesn't run"
fi

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Script Usage

Infinite Loop

Endless loop:

#!/bin/bash
while true; do
    echo "Running..."
    sleep 1
done

Placeholder

Placeholder command:

#!/bin/bash
# Placeholder for future code
if condition; then
    true  # Do nothing for now
else
    echo "Error"
    false  # Indicate failure
fi

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Conditional Logic

Test Conditions

Boolean testing:

#!/bin/bash
if some_command; then
    true  # Success path
else
    false  # Failure path
fi

Short-circuit

Logical operations:

# Short-circuit AND
command1 && true

# Short-circuit OR
command1 || false

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Troubleshooting

Commands Not Found

Check installation:

# true and false are part of coreutils
# Usually pre-installed

# Check commands
which true
which false

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Summary

This guide covered true and false usage, exit codes, and script logic for Arch Linux, CachyOS, and other distributions.

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Next Steps

• test Guide - Conditional testing
• Bash Scripting Guide - Scripting basics
• true Documentation: man true
• false Documentation: man false

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