Essential Books

While Loop

suggest change 
#! /bin/bash

i=0

while [ $i -lt 5 ] #While i is less than 5
do
    echo "i is currently $i"
    i=$[$i+1] #Not the lack of spaces around the brackets. This makes it a not a test expression
done #ends the loop

Watch that there are spaces around the brackets during the test (after the while statement). These spaces are necessary.

This loop outputs: 

i is currently 0
i is currently 1
i is currently 2
i is currently 3
i is currently 4
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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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