Programming Constructs

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For Loops

For loops are a fundamental programming construct used to execute a block of code repeatedly. They are particularly useful when you need to process a sequence of items, like elements in a list or characters in a string.

Example:

#!/bin/bash

for filename in `seq 10` ##sets the variable filename as the output of seq 10

touch video$filename.mp4 ##create file video$filename.mp4

done

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While Loops

While loops are another common programming construct for repeated execution of code blocks. They differ from for loops in how they determine how many times to run.

Example:

#!/bin/bash

filenum=10 ##variable filenum has a value of 10##

while [ $filenum -gt 0 ] ##while variable filenumber is greater than 0

touch vide$filenum.mp4 ##create a file video$filenum.mp4

filenum=$(($filenum -1)) ##change variable filenum to it's current value -1

done

In this example, a while loop is being used to create 10 files, all numbered, counting down from 10 until the value of 0 is reaching - meaning that 10 files are created.

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