BASH-Array

 Working with BASH Array

Declare an Array:

Server1>declare -a ARRAY

Added Elements to an Array:

Server1>ARRAY=(mango banana pear kiwi)

[@] & [*] print all elements in an ARRAY

Server1>echo ${ARRAY[@]}

mango banana pear kiwi

Server1>echo ${ARRAY[*]}

mango banana pear kiwi

Print Index values in an ARRAY:

Server1>echo ${!ARRAY[*]}

0 1 2 3

Size of an ARRAY:

Server1>echo ${#ARRAY[*]}

4

Print all elements in an ARRAY:

Server1>declare -p ARRAY

declare -a ARRAY='([0]="mango" [1]="banana" [2]="pear" [3]="kiwi")'

Update an Array:

Server1>ARRAY[0]=Apple

Server1>declare -p ARRAY

declare -a ARRAY='([0]="Apple" [1]="banana" [2]="pear" [3]="kiwi")'

Append  ARRAY:

Server1>declare -p ARRAY

declare -a ARRAY='([0]="mango" [1]="banana" [2]="pear" [3]="kiwi")'

Server1>ARRAY=(${ARRAY[@]} Orange)

Server1>declare -p ARRAY

declare -a ARRAY='([0]="mango" [1]="banana" [2]="pear" [3]="kiwi" [4]="Orange")'

Server1>declare -p ARRAY

declare -a ARRAY='([0]="mango" [1]="banana" [2]="pear" [3]="kiwi" [4]="Orange")'

Server1>ARRAY+=(Pinnaple)

Server1>declare -p ARRAY

declare -a ARRAY='([0]="mango" [1]="banana" [2]="pear" [3]="kiwi" [4]="Orange" [5]="Pinnaple")'

For loop to print elements in ARRAY:

Server1>for i in ${ARRAY[@]};do echo $i;done

Apple

banana

pear

kiwi

For loop to print elements using Index value:

Server1>for i in ${!ARRAY[@]};do echo ${ARRAY[i]};done

Apple

banana

pear

kiwi

Replace Elements in Array:

Server1>echo ${ARRAY[@]}

Apple banana pear kiwi

Server1>echo ${ARRAY[@]//Apple/Pinapple}

Pinapple banana pear kiwi