Evaluate a group of commands while a condition is true
while(<condition>) <commands> endwhile()
All commands between while and the matching
endwhile() are recorded without being invoked. Once the
endwhile() is evaluated, the recorded list of commands is invoked as long as the
<condition> is true.
<condition> has the same syntax and is evaluated using the same logic as described at length for the
Per legacy, the
endwhile() command admits an optional
<condition> argument. If used, it must be a verbatim repeat of the argument of the opening
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