The Easy Way to get Array Data in Shell-Script

Here is an easy way to get array data. Below, you will find a script and explains to get array data.

How to assign values to arrays

Here are two different ways to assign values to arrays. Those are one at a time and all at once.
You can assign values to an array from different sources, including wildcard expansion and program output.
Shell automatically detects if the array declares from the above two methods. Else, declare -a myarray statement is needed.

One at a time

numberarray[0]=zero

All at once

students=(Dave Jennifer Michael Alistair Lucy Richard Elizabeth)

Shell Script

You need to use dollar sign $ to get array data. The rate (@ ) says all the array values. The echo -en says two things. The -e tells to enable interpretation of backlash, and -n does not print the trailing newline after finishing the command.

$ vi studentarray.sh
#!/bin/bash

students=(Dave Jennifer Michael      # year 1
  Alistair Lucy Richard Elizabeth    # year 2 
  Albert Roger Dennis James Roy      # year 3
  Rory Jim Andi Elaine Clive         # year 4
  )

for name in ${students[@]}
do
  echo -en "$name "
done
echo

$ ./studentarray.sh
Dave Jennifer Michael Alistair Lucy Richard Elizabeth Albert Roger Dennis James Roy Rory Jim Andi Elaine Clive
$