Essential Books

Using For Loop to List Iterate Over Numbers

suggest change 
#! /bin/bash

for i in {1..10}; do # {1..10} expands to "1 2 3 4 5 6 7 8 9 10"
    echo $i
done

This outputs the following: 

1
2
3
4
5
6
7
8
8
10
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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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