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This article mainly introduces "the usage of Linux basic command watch". In daily operation, I believe many people have doubts about the usage of Linux basic command watch. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "the usage of Linux basic command watch"! Next, please follow the editor to study!

Watch

The watch instruction can execute the program intermittently, displaying the output in full-screen mode, which is executed once every 2 seconds by default. Watch will run until it is interrupted.

The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

2. Grammar

Watch [- dhvt] [- n] [--differences [= cumulative]] [--help] [--interval=] [--no-title] [--version]

2. List of options

Option

Description

-d |-- differences

Highlight the difference

-- cumulative

Highlight "sticky"

-n

Specify time interval

-t |-- no-title

Date, time and interval seconds are not displayed

-h |-- help

Help information

-v |-- version

Display version information

3. Example code

Check email

Watch-n 60 from

View changes in the contents of the directory

Watch-d ls-l

If you are only interested in files owned by user Joe, you can use the

Watch-d'ls-l | fgrep joe'

To see the effect of quotation marks, give it a try

Watch echo $$

Watch echo'$$'

Watch echo "" $$"

You can monitor the administrator to install the latest kernel.

Watch uname-r

4. Examples

Execute the ls instruction every 3 s

[root@localhost ~] # watch-n 3 ls / / execute ls every 3 seconds

Every 3.0s: ls Sun Sep 23 09:04:40 2018

one

1.c ~

Anaconda-ks.cfg

Icmp_echo_ignore_all~

Icmp_echo_ignore_alv~

Icmp_echo_ignore_alw~

Icmp_echo_ignore_alx~

Icmp_echo_ignore_aly~

Icmp_echo_ignore_alz~

Install.log

Install.log.syslog

Mail

Nohup.out

Public

Template

Video

Picture

Document

download

Music

Desktop

At this point, the study of "the usage of the Linux basic command watch" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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