Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Arrays

If you come from a developer background or have dabbled in programming, you will have (probably) come across the term array. If we needed to explain arrays in a single sentence, it would look like this: Arrays allow us to store a collection of data of the same type. To make this a little less abstract, we'll show you how we can create an array of strings in Bash:

reader@ubuntu:~$ array=("This" "is" "an" "array")reader@ubuntu:~$ echo ${array[0]}Thisreader@ubuntu:~$ echo ${array[1]}isreader@ubuntu:~$ echo ${array[2]}anreader@ubuntu:~$ echo ${array[3]}array

In this string array, we place four elements:

• This
• is
• an
• array

If we want to print the string in the first place in the array, we need to specify that we want the zeroth position ...