Jan 2, 2022 · A while loop is a control flow statement in Bash scripting that allows a certain block of code to be executed repeatedly as long as a specified condition is true. The loop provides a way to automate repetitive tasks and is a fundamental construct in scripting and programming.

Mar 3, 2020 · In this tutorial, we’ll cover the while loop in shell script. A while loop in shell scripts is used to repeat instructions multiple times until the condition for the loop stays true. Loops have a lot of use cases in real-world applications, since we create them to automate repetitive tasks.

Jan 3, 2024 · In this article we discussed looping statements in Bash scripting, covering while, for, and until loops. It introduces the use of break and continue statements to modify loop behavior. Practical examples illustrate the implementation of loops, including iterating over color values, creating infinite loops, and building an interactive loop for ...

Mar 20, 2022 · The while loop in a Linux Bash script is a type of loop that continues to execute as long as the programmed condition remains true. while loops are useful when you need to repeatedly execute a set of instructions a certain number of …

Mar 12, 2024 · The bash while loop is a control flow statement that allows code or commands to be executed repeatedly based on a given condition. For example, run echo command 5 times or read text file line by line or evaluate the options passed on the command line for a script. The syntax is as follows: command1. command2. command3. done.

Another useful trick is the while read loop. This example uses the case statement, which we'll cover later. It reads from the file myfile.txt, and for each line, tells you what language it thinks is being used. (note: Each line must end with a LF (newline) - if cat myfile.txt doesn't end with a blank line, that final line will not be processed.)

Mar 19, 2024 · The while loop syntax. The syntax is: while [ condition ] do command1 command2 .. .... commandN done Command1..commandN will execute while a condition is true. To read a text file line-by-line, use the following syntax:

Mar 11, 2021 · The basic loop commands in Bash scripts are for and while. for loops are typically used when you have a known, finite list, like a series of numbers, a list of items, or counters. while loops can be used with lists but are also useful for conditions that do not have a known limit.

Mar 17, 2024 · In this article, I will show you 8 distinct example of a while loop in bash. You’ll understand how versatile the while loop is for carrying out several activities. Continue reading. 1. Execute “while” Loop a Certain Number of Times. The while loop can execute a block of codes a certain number of times.

The while loop is a versatile and essential tool in shell scripting that allows you to automate tasks, validate input, and handle waiting scenarios. Understanding how to use while loops effectively empowers you to create more robust and efficient scripts in your Unix-like environment.