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
do
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 [ $filenum -gt 0 ] ##while variable filenumber is greater than 0
do
touch vide$filenum.mp4 ##create a file video$filenum.mp4
filenum=$(($filenum -1)) ##change variable filenum to it's current value -1
doneIn 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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