Execute consequent-commands as long as test-commands has an exit status of zero
Syntax while 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 were executed.
“Men talk of killing time, while time quietly kills them” ~ Dion Boucicault
case - Conditionally perform a command
for - Expand words, and execute commands
if - Conditionally perform a command
until - Execute commands (until error)
Equivalent Windows commands: IF - Conditionally perform a command.