The until command in Linux

The until command is just the opposite of the while command, and the until command requires a test command that typically results in a non-0 exit state, as long as the exit status of the test command is not 0,bash the shell executes the command listed in the loop, and once the test condition returns 0 exit, the loop stops!

Until Format command:

Until test commands

Do

Other Conmands

Done

Example:

#!/bin/bash

var1=10

Until [$var 1-eq 0]

Do

echo $var 1

var1=$[$var 1-2]

Done

[Email protected] ~]#./test12.sh

10

8

6

4

2

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The until command in Linux