Linux watch command

Watch is a very practical command. Basically all Linux distributions have this tool, just like the name, watch
It can help you monitor the running results of a command, saving you the need to manually run it over and over again.

 

Directly following the command you want to run behind watch, watch will help you repeat and update the results on the screen.

 

By default, watch will run commands repeatedly between two seconds. You can also use the-n parameter to specify the time interval ~

 

Another practical parameter is-D. In this way, watch will help you highlight the changed area, which makes it clearer ~

CTRL + C to exit ~

 

You can use it to monitor the result changes of all the commands you want, such as tail a log file, ls to monitor the size changes of a file, and check your imagination ~

--------------------------------------------------------------------------------
FreeBSD
Different from the watch command in Linux
In Linux, watch periodically runs the next program and displays the execution result in full screen mode.

-D, -- differences [= cumulative] highlight changes
-N,
-- Interval = <seconds> period (seconds)

 

For example, watch-N 1-D netstat-ant

 

The watch command in FreeBSD is to view the running operations of other users. Watch allows you to peek at what other terminal is doing. This command can only
To be used by Super Users.

 

How to run watch:

[Root @ PDC conf] # Who
Root ttyp0 Oct 2
(192.168.x.x)
Root ttyp1 Oct 2 (192.168.x.x)
Xxhui
Ttyp3 Oct 2 23: 48 (192.168.x.x)
[Root @ PDC conf] # Watch ttyp3