@node While, Window, Whatis, Commands

@iftex
@syntax While.
@end iftex
@example
Syntax: WHILE @{ expr @} @{ commands @}
@end example
@pindex While


   Repeat the @code{commands} while the @code{expr} is true.
You can break out of the loop early with the BREAK command (@pxref{Break}).

There is further discussion in section @xref{Loops and If}.

  For example,
@example
define i 0
while@{$i < 10@} @{
        echo Hi $i
        define i ($i+1)
@}
@end example
@noindent
is equivalent to either
@example
do i=0,9 @{
        echo Hi $i
@}
@end example
@noindent
and
@example
set i=0
while@{i != 100@} @{
        if(i == 10) @{ break @}
        echo Hi $(i)
        set i=i+1
@}
@end example
@noindent
except in so much as which variables and vectors are defined at the end.