Mac OS X Panther in a Nutshell, 2nd Edition

Name

while

Synopsis

                     while 
                     (
                     expression 
                     )
                     commands
                     end
                  

As long as expression is true (evaluates to nonzero), evaluate commands between while and end. break and continue can terminate or continue the loop.

Example

                     set user = (alice bob carol ted)
                     while ($argv[1] != $user[1])   
                     Cycle through each user, checking  for a match
                     shift user                  
                     If we cycled through with no match...
                     if ($#user =  = 0) then
                          echo "$argv[1] is not on the list of users"
                          exit 1
                        endif
                     end