What is difference between while and until?

Note that the only difference between while and until is the way the condition is handled. In while , the loop executes as long as the condition is true; in until , it runs as long as the condition is false.

What is the main difference between a for loop and a while loop?

The difference between for loop and while loop is that in for loop the number of iterations to be done is already known and is used to obtain a certain result whereas in while loop the command runs until a certain condition is reached and the statement is proved to be false.

Do While loop in bash shell?

There is no do-while loop in bash. To execute a command first then run the loop, you must either execute the command once before the loop or use an infinite loop with a break condition.

What is the difference between while loop and repeat until loop?

With a WHILE loop, the code within the iteration may never be executed. With a REPEAT UNTIL loop, the code is always executed at least once.

What do the while and until constructs do?

Basically, while & until loops will only execute if the initial condition is met, think of while loops while, if the current condition is met only then will it work. However, until loops will wait until the condition is met.

How while and until loop is implemented in shell programming?

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. The until loop is almost equal to the while loop, except that the code is executed while the control expression evaluates to false.

How do you end a while loop in bash?

Infinite while Loop You can also use the true built-in or any other statement that always returns true. The while loop above will run indefinitely. You can terminate the loop by pressing CTRL+C .

What is difference between wait until and repeat until?

while loops continue on as long as their condition is met. Since wait() always exists, then that condition is met and is true. Therefore the script will loop until that statement is false.

What is the difference between until loop and while loop in Python?

The key difference between until loop and while loop is in the test condition. A while loop will keep running as long as the test condition is true; on the flip side, an until loop will keep running as long as test condition is false!

Is there a DO-WHILE loop in Bash?

If you are coming from a C/C++ background, you might be looking for a do-while loop but that one doesn’t exist in bash. There is another kind of loop that exists in bash. The until loop follows the same syntax as the while loop: The key difference between until loop and while loop is in the test condition.

What is the difference between until and while statement in Bash?

The until statement is very similar in syntax and function to the while statement. The only real difference between the two is that the until statement executes its code block while its conditional expression is false, and the while statement executes its code block while its conditional expression is true. Bash Until Example 5.

What is the difference between for and while loop in C++?

The for/whileloops are executed while the condition is true. On the other hand, untilloops are iterated untilthe condition is true, meaning that the loops are executed while the condition is false. With these key differences in mind, let’s go over the syntax and examples of for, whileand untilloops in the following.