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while
-----
Evaluate a group of commands while a condition is true
::
while(condition)
COMMAND1(ARGS ...)
COMMAND2(ARGS ...)
...
endwhile(condition)
All commands between while and the matching :command:`endwhile` are recorded
without being invoked. Once the :command:`endwhile` is evaluated, the
recorded list of commands is invoked as long as the condition is true. The
condition is evaluated using the same logic as the :command:`if` command.
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