Commands Sequence

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 results by running cat results.txt.

Let’s modify photo-backup.sh with the following changes. Click on the Run button and then execute the script.

The script contains one command that is too long. This makes it hard to read and modify. We can split the command into two parts. The following shows how it looks like:

#!/bin/bash

tar -cjf ~/photo.tar.bz2 ~/photo &&
  echo "tar - OK" > results.txt ||
  ! echo

...