Execute consequent-commands as long as test-commands has an exit status of zero

      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.

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