Unix Top Command

Here's the above explanation in clean, semantic HTML format: ```html

Unix top Command - Usage Guide

🔍 What top Shows

When you run top, it displays:

1. System Summary

• uptime: How long the system has been running.
• users: Number of logged-in users.
• load average: 1, 5, and 15 minute load.
• Tasks: Total, running, sleeping processes, etc.
• CPU usage:
  • %us: user processes
  • %sy: system/kernel processes
  • %id: idle time
  • %wa: I/O wait
  • %hi: hardware interrupts
  • %si: software interrupts
  • %st: steal time (VMs)
• Memory and Swap: Total, used, free, buffers, etc.

2. Process List

Displays information per process:

• PID: Process ID
• USER: Owner
• %CPU: CPU usage
• %MEM: Memory usage
• TIME+: Total CPU time used
• COMMAND: Command name

🛠️ Common Day-to-Day Usage in Production

• Find High CPU Usage: Use P to sort by CPU usage.
• Check Memory Leaks: Use M to sort by memory usage.
• Identify Stuck or Zombie Processes: Look for state Z.
• Check Load Averages: High load may indicate system stress.
• Check I/O Wait: High %wa indicates disk bottlenecks.
• Kill a Misbehaving Process: Use k and enter PID.

🧠 Useful Keybindings in top

Key	Action
P	Sort by CPU usage
M	Sort by memory usage
k	Kill a process (enter PID)
R	Renice a process
c	Toggle full command display
1	Show all CPU cores
h	Help
q	Quit

🧪 Pro Tips

• Use top -u <username> to filter by user.
• Use top -p <PID> to monitor a specific process.
• Use htop for a more visual alternative (if installed).

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