Examples of several methods for shell to realize program dead cycle

Time:2020-1-12

Preface

Sometimes it is necessary to create a dead loop in the script, or let the program run continuously until a certain condition exits the loop.

For ape people familiar with C language, the simplest dead cycle should be written as follows:


while(1)

{

//do something

}

Or you can use the for statement and the do… While statement to implement it, not to mention here!

Implementation method

But how to write a loop in a shell script? While is also used at this time. It summarizes several ways to keep the shell script running:

Here’s an example: use while: to keep the program running until you press Q or Q to exit

Script output:

summary

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