Essential Books

For Loop without a list-of-words parameter

suggest change 
for arg; do
    echo arg=$arg
done

A for loop without a list of words parameter will iterate over the positional parameters instead. In other words, the above example is equivalent to this code: 

for arg in "$@"; do
    echo arg=$arg
done

In other words, if you catch yourself writing for i in "$@"; do ...; done, just drop the in part, and write simply for i; do ...; 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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