Essential Books

For Loop

suggest change 
#! /bin/bash

for i in 1 "test" 3; do #Each space separated statement is assigned to i
    echo $i
done

Other commands can generate statements to loop over. See “Using For Loop to Iterate Over Numbers” example.

This outputs: 

1
test
3
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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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