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htop is an interactive process viewer and system monitor. Enhanced version of top with better visualization, mouse support, and easier navigation.

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Basic Usage

• htop - Start interactive monitor

• htop -u user - Show only user processes

• htop -p PID1,PID2 - Monitor specific PIDs

• htop -s column - Sort by column

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Interactive Keys

• F1 - Help

• F2 - Setup (configure display)

• F3 - Search process

• F4 - Filter processes

• F5 - Tree view

• F6 - Sort by column

• F7 - Decrease nice (higher priority)

• F8 - Increase nice (lower priority)

• F9 - Kill process

• F10 - Quit

• Space - Tag process

• u - Show processes of specific user

• t - Tree/List view toggle

• H - Show/hide threads

• K - Show/hide kernel threads

• P - Sort by CPU

• M - Sort by memory

• T - Sort by time

• / - Search

• \ - Filter

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Command Line Options

• -d delay - Update delay in seconds

• -u user - Show only user processes

• -p PID - Show only specific PIDs

• -s column - Sort by column

• -C - No color

• -t - Tree view by default

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Common Examples

Basic Monitor

htop

Start interactive monitor.

User Processes

htop -u username

Show only specific user.

Sort by Memory

htop -s PERCENT_MEM

Start sorted by memory usage.

Tree View

htop -t

Start in tree view.

Specific PIDs

htop -p 1234,5678

Monitor specific processes.

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Tips

• Use F6 to change sort column

• Use F4 to filter processes

• Use F5 for tree view to see process hierarchy

• Use F9 to kill processes

• Use F7/F8 to adjust process priority

• Much more user-friendly than top

• Supports mouse interaction

• Essential for system monitoring