Which command is used to create a loop in shell scripting that continues until a specified condition becomes true?

The command used to create a loop that continues until a specified condition becomes true is the "until" command. This command allows a script to repeatedly execute a block of code as long as a specified condition evaluates to false. Once the condition becomes true, the loop terminates.

The "until" loop is particularly useful in scenarios where you need to wait for a certain state to change or a condition to be met before proceeding. For example, an "until" loop could be employed to check if a file exists or if a service is running, and it will keep executing the commands in the loop until the condition is satisfied.

The other commands serve different purposes. The "for" command is used for iterating over a sequence of values, usually defined in a list or array. This makes it suitable for scenarios where you need to execute a block for a known number of iterations. The "while" command creates a loop that continues as long as a given condition is true, making it the opposite of the "until" command. The "repeat" command, while not standard in all shell environments, is used in some variations of scripting but does not align with the typical constructs provided by standard shell programming that involves "until," "while," and "