Essential Books

Looping over an array

suggest change

for loop: 

arr=(a b c d e f)
for i in "${arr[@]}";do
    echo "$i"
done

Or 

for ((i=0;i<${#arr[@]};i++));do
    echo "${arr[$i]}" 
done

while loop: 

i=0
while [ $i -lt ${#arr[@]} ];do
    echo "${arr[$i]}"
    i=$(expr $i + 1)
done

Or 

i=0
while (( $i < ${#arr[@]} ));do
    echo "${arr[$i]}"
    ((i++))
done
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Control structures:
* Control Structures
* Conditional execution of command lists
* If statement
* Looping over an array
* Using For Loop to List Iterate Over Numbers
* Loop break
* For Loop with C-style syntax
* continue and break
* While Loop
* Switch statement with case
* For Loop without a list-of-words parameter
* Until Loop
* For Loop
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