Shulou(Shulou.com)06/03 Report--

What the editor shares with you today is the use of the linux system's own program / bin/true and / bin/false. I believe most people don't know much about it. In order to make you understand better, the editor summarizes the following content for you. Without saying much, let's move on.

/ bin/true returns 0

/ bin/false returns 1 (or a non-zero value)

Commonly used for self-writing scripts to set $according to their own logic? Example of the value of / bin/trueecho $? # result 0/bin/falseecho $? # use instructions for result 1

# two function, which refer to / etc/init.d/functions and use the action function

#

[server]-[root@arrow ~] $action "test" / bin/true; echo $? test [OK] 0 [server]-[root@arrow ~] $action "test" / bin/false; echo $? test [OK] attention to the following actual echo $? The returned 0 is the result of action # the two items above return the result of true false [server]-[root@arrow ~] $action "test" Echo $? test [OK] 0Murray- -Start_Nginx () {if [- f $pidfile] Then echo "Nginx is running" else / usr/local/nginx/sbin/nginx & > / dev/null action "Nginx is Started" / bin/truefi} # Stop_Nginx () {if [- f $pidfile] Then / usr/local/nginx/sbin/nginx-s stop & > / dev/null action "Nginx is Stopped" / bin/trueelse action "Nginx is Stopped" / bin/falsefi}

The above are the details of the use of the linux system's own programs / bin/true and / bin/false. Have you gained anything after reading it? If you want to know more about it, you are welcome to follow the industry information!

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