Scripts with loops

Learning outcomes:

• Use a script with a loop to explain how loops works
• Demonstrate how to debug a script with a loop

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• What is a loop
• Loop takes care of repetitive tasks
• Not the same as if/else or case statements
• Use Cases
• Move or delete files over a certain size/age/attribute
• Number manipulation (such as increase all numbers by 1)
• Changing whole folders of files (such as adding time stamps or changing permissions)
• Searching for a value
• Check computer status (such as is the server up)
• Tutorial on Bash Scripting with code examples
• While loops
• While runs as long as condition is successfully executing, stops when condition is false
• Some example use cases might be counting, or reading input
• While loop documentation with example code
• For loops
• Also called a for-each
• Some example use cases might be if you needed to process a sequence or list of items,or work with items from another command such as cat or ls
• For loop documentation with example code
• Until loops
• Similar to the while loop, but the thing happens until the condition is met
• Some use cases might be if you needed a sequence or specific input
• Until loop documentation with example code

Suggested Activities and Discussion Topics:

• Watch This Video and follow along.

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