commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
If you add the -d flag each difference in the command's output will be highlighted.
I also monitor individual drives by adding them to df. Makes for a nice thin status line that I can shove to the bottom of the monitor.
Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking.
Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates.
If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080".
Great for watching things like Maildir's or any other queue directory.
This command counts the number of blocked NGINX processes every 2 seconds and shows the last 22 measurements
You should have at least the number of cpu's in a non-blocked state.
The command up to the first ; truncates the log file.
Clock will appear in the top-right corner
Shows a simple clock in the console
-t param removes the watch header
Ctrl-c to exit
A console clock with the current time.
Binary clock with separate H:M:S.
This is maybe helpfull from system overheat on your linux box
1) -n option of watch accepts seconds
2) -t option of notify-send accepts milliseconds
3) All quotes stated in the given example are required if notification
message is more than a word.
4) I couldn't get this to run in background (use of & at the end fails). Any
To monitor .vmdk files during snapshot deletion (commit) on ESX only (ESXi doesn't have the watch command):
1. Navigate to the VM directory containing .vmdk files.
# watch "ls -tough --full-time *.vmdk"
-t sorts by modification time
-o do not list group information (to narrow the output)
-u sorts by access time
-g only here for the purpose to easily remember the created mnemonic word 'tough'
-h prints sizes in human readable format (e.g., 1K 234M 2G)
--full-time sets the time style to full-iso and does not list user information (to narrow the output)
optionally useful parameters to the watch command:
-d highlight changes between updates
-n seconds to wait between updates (default is 2)
-t turn off printing the header
Change HH:MM with your target time.
This is for a Debian/Ubuntu GNU system. You need bash (package bash), date (package coreutils) and toilet (package toilet). Install with:
# apt-get install bash coreutils toilet toilet-fonts
Figlet is easy to find for download on the internet, and works for any text. Quite cool.
This command shows the size of directories below here, refreshing every 2s.
It will also track directories created after running the command (that what the find bit does).
Show active calls as the happen on an Asterisk server. Note that the Asterisk command (in single quotes) is formatted for Asterisk 1.6. Use the -n flag on the watch command to modify the refresh period (in seconds - default is 2 seconds).
-n means refresh frequency
you could change eth0 to any interface you want, like wlan0
Show a simple table with disk IO for the specified host. you monitor a LOT of different thing. Mostly used for MRTG and similar, but this is nice for a quick look, which disk is busy.
"public" is your SNMP community
ensure that snmpd is running on the host which you intend to monitor
It's not my code, but I found it useful to know how many open connections per request I have on a machine to debug connections without opening another http connection for it.
You can also decide to sort things out differently then the way it appears in here.