for

1. Using For Loop to List Iterate Over Numbers

for i in {1..10}; do echo $i; done

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2. Array Iteration

a=(1 2 3 4)

for y in "${a[@]}"; do echo "$y"; done

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3. For Loop with C-style syntax

for (( i = 0; i < 10; i++ )); do echo "The iteration number is $i"; done

The iteration number is 0
The iteration number is 1
The iteration number is 2
The iteration number is 3
The iteration number is 4
The iteration number is 5
The iteration number is 6
The iteration number is 7
The iteration number is 8
The iteration number is 9