Execute consequent-commands as long as test-commands has an exit status which is not zero.
Syntax until test-commands; do consequent-commands; done
The return status is the exit status of the last command executed in consequent-commands, or zero if none was executed.
“The act of bell ringing is symbolic of all proselytizing religions. It implies the pointless interference with the quiet of other people” ~ Ezra Pound
case - Conditionally perform a command
for - Expand words, and execute commands
if - Conditionally perform a command
while - Execute commands
Equivalent Windows command: IF - Conditionally perform a command