linux-shell-for and array code examples

#!/bin/bash

for ((i=1;i<=5;i++))
do
userlist[$i]="skyuser"$i

echo ${userlist[$i]}
done

echo ${userlist[*]}
for user in ${userlist[*]}
do
echo $user
done

Initializing the array

my_array=(a b c d)
[root@VM_158_86_centos vbird]# my_array=(a b c d)
[root@VM_158_86_centos vbird]# echo ${my_array[*]}
a b c d

Array assignment

array_name[0]=value0
array_name[1]=value1
array_name[2]=value2

Reading the array

${array_name[index]}

Getting all elements of the array

${array_name[*]}
${array_name[@]}

[root@VM_158_86_centos vbird]# echo ${my_array[*]}
a b c d

Get the array length

${#array_name[*]}
[root@VM_158_86_centos vbird]# echo ${#my_array[*]}
4

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