Linux in a Nutshell, Third Edition

Name

while

Synopsis

while ( expression )

    commands

end

Description

As long as expression is true (evaluates to nonzero), evaluate commands between while and end. break and continue can be used to 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