whileloops are useful in scripts that depend on a certain condition to be true or false, but you can also use them interactively to monitor some condition. The important things to remember are: Always be clear about what is the condition toendthe loop. If that is something that you expect...
Awhileloop inbashconsists of a conditional expression and a loop body which is surrounded bydoanddone. The loop body continues to be executed as long as the condition evaluates to true. The conditional expression inwhileloop can be surrounded by either a pair of single square brackets or a p...
Below are some practical examples of using theuntilloop. The examples involve using the loop in Bash scripts to help you understand how it works and how to use it. Example 1: Basic Counting Loop The following example shows how to use theuntilloop to create a basic counting loop that counts...
In bashfor,while, anduntilare three loop constructs. While each loop differs syntactically and functionally their purpose is to iterate over a block of code when a certain expression is evaluated. Untilloop is used to execute a block of code until the expression is evaluated to be false. This...
Example 02: Nested While Loop Let’s have our second example which will show us how to use the nested while loop in bash. So, the code has been started with the same bash extension in the nano bash file. The iterator “i” has been set to 0. The while loop has been started with...
How to create Bash While Loop? Find your answers here! This article contains all the information you need to create bash while loop on your own.
Breaking from a while Loop Use thebreakstatement to exit awhileloop when a particular condition realizes. The following script uses abreakinside awhileloop: #!/bin/bash i=0 while [[ $i -lt 11 ]] do if [[ "$i" == '2' ]] ...
Also, we will discuss the topic with necessary examples and explanations to make the topic easier to understand. We will stop the three most used loops: while, for, and until. Let us start one by one. Break Out of the while Loop in Bash You can use the keyword break with the while ...
Create an Infinite Loop UsingwhileWith Multiple Lines of Commands in Bash This example just reorganizes the code structure from single line to multi-line. Below is the example code: whiletruedoecho"Hello World"sleep2done The above code will show the same result as our previous example. We u...
While it is possible to use this style correctly, it is harder: Backticks require escaping when nested, and examples in the wild are improperly quoted more often than not.Not to mention this insidious trick:> x=`echo "This is a doublequote: \""`; echo "$x" This is a doublequote: ...