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!" 3. If you need to read a file line by line and perform some action with each line - then you should use a while read line construction in Bash, as this is the most proper way to do the necessary.. bash script while loop if variable is true Ask Question Asked 10 years, 3 months ago Modified 10 years, 3 months ago Viewed 30k times 2 I have the following bash script: while [ $loop == "true" ] do //do stuff done but it says error at [. The syntax of the while loop in a bash script is the following. It means the loop will execute the commands repeatedly until the condition remains true. Furthermore, there are differences of the implementation, that are different from distribution to distribution. In the following example, you are simply picking the columns from a text file with a predictable format and printing the values that you want to use to populate an /etc . Bash (Yes/No) Prompt. How to use for/while/until loop in bash - Xmodulo They say, while an expression is true, keep executing these lines of code. This means that you can also use the while-loop construct as a way to do an infinite loop when combined . Logan_2 0 Newbie Poster . 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. To evaluate the conditions bash has a built-in command called "test". - that other guy. kubectl run sleep infinity. while true i+=1 echo in bash window. Sytnax The Bash has three types of looping constructs namely for, while, and until. while true is fine as a general-purpose "loop forever" construction. bash while loop with yes or no . Bash While True is a bash While Loop where the condition is always true and the loop executes infinitely. Bash until Loop # The until loop is used to execute a given set of commands as long as the given condition evaluates to false. This concept of break and continue are available in popular programming languages like Python. Conclusion Bash Scripting Cheat Sheet. Answer: I usually use the shell script read function to read input from a shell script. Scripting. The until loop is almost equal to the while loop, except that the code is executed while the control expression evaluates to false. The while executes a piece of code if the control expression is true, and only stops when it is false (or a explicit break is found within the executed code.