Learn Linux Shell Scripting - Fundamentals of Bash 4.4

The until loop

While has a twin: until. An until loop does exactly what while does, with only one difference: the loop only runs as long as the condition is false. As soon as the condition becomes true, the loop no longer runs. We'll make some minor changes to the previous script and we'll see how until works:

reader@ubuntu:~/scripts/chapter_11$ cp while-counter.sh until-counter.shreader@ubuntu:~/scripts/chapter_11$ vim until-counter.sh reader@ubuntu:~/scripts/chapter_11$ cat until-counter.sh #!/bin/bash###################################### Author: Sebastiaan Tammer# Version: v1.0.0# Date: 2018-10-27# Description: Example of an until loop with a counter.# Usage: ./until-counter.sh ###################################### Define the counter ...