Array variable | Shell Scripting

#linux #bash #devops #tutorial

This is a multipart blog article series where I am going to explain the concepts of shell scripting and how to write a shell script in Linux, UNIX or Mac based systems. You can also follow this tutorial blog using windows but for that you have to install a bash from.

In this article we will learn about array in shell scripting. And see how to perform different operations on array.

We can declare array in this way <name_of_array_variable>=(“Ubuntu” “Windows” “Kali”). By this way we can declare an array and store some value in it.
To print all the values of array just write this command echo ${<name_of_array_variable>[<index_location>]}. For example: echo ${os[@]}
If you want to print a specific value of the array than you can use this command echo ${<name_of_array_variable>[<index_location>]}. For example: echo ${os[1]}
If you want to print the index of the array than you can do it like this echo ${!<name_of_array_variable>[@]}. For example: echo ${!os[@]}
If you want to pint the length of an array than you can do it like this echo ${#<name_of_array_variable>[@]}. For example: echo ${#os[@]}
We can add elements to array in this way <name_of_array_variable>[index_location]=”<value>”. For example: os[3]=’mac’
We can update the data of an array in the same way <name_of_array_variable>[index_locaiton]=”<value>”. For example: os[0]=’mac’
If you want to remove an element from an array then you can do it by using unset command like this unset <name_of_array_variable>[index_location]. For example: unset os[2]