Bash While Loop | Reading Files in Shell Script | File Read line by line Shell | Learn Bash Tutorial

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Bash Scripting Tutorial - While Loop | Shell Scripting Linux | File Reading in Shell Script

while loop is an alternative to for loop. It is used to execute group of statements between do and done blocks.

In this tutorial, you can learn and practice the while loop and its type of retrieval in bash scripting.
This tutorial includes the following types of while loop in shell programming...
1. Unix Style Based While Loop
2. C Style Based While Loop
3. File Style Based While Loop

Tools used:
OS : Windows 10
Type of Shell : Bash Shell

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Wow this is bad.

What is this crap about 3 different types of while?
There is exactly one while, it's defined in the manual page.

while list-1; do list-2; done

The while command continuously executes the list list-2 as long as the last command in the list list-1 returns an exit status of zero.

The [[ builtin command returns an exit status of 0 only if the test passes.
The (( builtin returns 0 if the value of the expression is non-zero
The read builtin returns 0 unless EOF is encountered

However those are not the only options, list-1 can be any list of 1 or more commands.

The 'file' based example destroys the line by not quoting it. So "A B" becomes "A B" when echoed.

zakpappnase

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