While Loop Bash
In Bash, the while loop is used to execute a block of commands repeatedly as long as a certain condition is true. The basic syntax is:
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while condition do # commands to be executed done |
Here’s an example that uses a while loop to count from 1 to 10:
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# Initialize the counter variable counter=1 while [ $counter -le 10 ] do echo $counter # Increment the counter ((counter++)) done |
This will print the numbers from 1 to 10, one per line.
The condition in the while loop can be any command that returns a boolean value (true or false). In the example above, the condition [ $counter -le 10 ] tests whether the value of counter is less than or equal to 10. As long as this condition is true, the loop will continue to execute.
It’s important to include a way to update the value of the condition variable inside the loop, otherwise the loop will become infinite. In the example above, the ((counter++)) statement increments the value of counter by 1 each time the loop iterates.
You can also use the break statement to exit a while loop prematurely, and the continue statement to skip the rest of the current iteration and move on to the next one.
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