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The widget iStat Pro allows to monitor different system stats like

  • CPU usage
  • network bandwidth in/out
  • memory usage
  • ...

How can I view such system stats in the Terminal?

enter image description here

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up vote 44 down vote accepted

Depending on what you want to see, there are several options on Terminal level:

  • top: show running processes, memory usage and similar stats
  • iostat: show I/O per terminal, device and SPU summery statistics
  • vm_stat: show Mach virtual memory statistics
  • df and diskutil list: report on drive space used and free
  • fs_usage: show file activity for both disk and network
  • nettop: display updated information about the network (a bit like top for net I/O)
  • w: display who is logged in, what they are doing and system load
  • ifconfig and ipconfig: network interface and IP protocol details

Most of these commands have a huge list of options, it's probably best to consult the man pages for details.

I usually rely on top -u -s 10 to identify CPU-hogging processes and fs_usage -f filesys/fs_usage -f network to identify processes generating a lot of disk/network load.

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This is what I wanted! Thanks. – gentmatt Feb 5 '12 at 19:25
@JMY1000 LOL, I actually like the idea of a process hugging the CPU :-) Thanks for the edit. – patrix Jun 17 at 13:51
@patrix Ah, the good ol' hug of death. – JMY1000 Jun 18 at 13:00

You can use top. It'll show CPU & RAM usage together with all the processes. It'll also show you network packets in/out, and discs data read/written.

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And with man top you can see how to customize the output. – Rene Larsen Feb 5 '12 at 13:13

The above are great commands. Also, I like to use

du -ks *

To show how much disk space all the folders below my current directory are using.

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If you are having network problems, especially with a server exposed to the Internet, lsof(1) can be extremely useful. It lists all open files.

For example, lsof | fgrep '/Library/WebServer/ will show you all the files that are open on your web server. I've been using this a lot to find and ban "leeches" and "bots" who are reducing my bandwidth by automatically sucking down file after file.

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Here are two commands for determining your local and public IP:

Local IP

ipconfig getifaddr en1

This is when using Wi-Fi. For ethernet use en0.

Public IP

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On current MacBook Airs (which don't have an ethernet port) the Wi-Fi device code is en0. You can find out what it is with networksetup -listallhardwareports | grep -E '(Wi-Fi|AirPort)' -A 1 | grep -o "en.". – user495470 Feb 23 '12 at 23:05

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