Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Functional checks

Now, we know how we can check the exit status of a process to determine if it was successful. However, that is not the only way we can validate the success/failure of commands. For most commands that we run, we could also perform a functional check to see if we were successful. In the previous script, we tried to create the /home/ directory. But what if we were more concerned with the existence of the /home/ directory, instead of the exit status of the process?

The following script shows how we can perform functional checks on the state of our system:

reader@ubuntu:~/scripts/chapter_09$ vim functional-check.shreader@ubuntu:~/scripts/chapter_09$ cat functional-check.sh #!/bin/bash###################################### Author: ...