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UNIX in a Nutshell: System V Edition

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while (expression)

As long as expression is true (evaluates to non-zero), evaluate commands between while and end. break and continue can be used to terminate or continue the loop. See also example under shift.


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

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