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The Complete Guide to Bash Programming

Commands Sequence

Explore how to structure Bash scripts with command sequences to automate tasks, handle failures properly using logical AND/OR operators, and control script termination with exit commands and braces. This lesson helps you understand script flow and error management techniques to create reliable automation scripts.

We'll cover the following...

The following demonstrates the script for making the photos backup:

#!/bin/bash
(tar -cjf ~/photo.tar.bz2 ~/photo &&
  echo "tar - OK" > results.txt ||
  ! echo "tar - FAILS" > results.txt) &&
(cp -f ~/photo.tar.bz2 ~/backup &&
  echo "cp - OK" >> results.txt ||
  ! echo "cp - FAILS" >> results.txt)

Click the Run button and then execute the bash script. We can observe the ...

#!/bin/bash
(tar -cjf ~/photo.tar.bz2 ~/photo &&
  echo "tar - OK" > results.txt ||
  ! echo "tar - FAILS" > results.txt) &&
(cp -f ~/photo.tar.bz2 ~/backup &&
  echo "cp - OK" >> results.txt ||
  ! echo "cp - FAILS" >> results.txt)
Running the bash scripts

Let’s modify ...