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