Until loop The until loop is very similar to the while loop, except that the loop executes until the TEST-COMMAND executes successfully. As long as this command fails, the loop continues. The syntax is the same as for the while loop: until TEST-COMMAND; do CONSEQUENT-COMMANDS; done The return status is the exit status of the last command executed in the CONSEQUENT-COMMANDS list, or zero if none was executed. TEST-COMMAND can, again, be any command that can exit with a success or failure status, and CONSEQUENT-COMMANDS can be any UNIX command, script or shell construct. Example :-- Write a shell script to display first ten positive numbers using until loop. Program num=1 until [ $num –gt 10 ]; do echo num ...
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