case word in [ [(] pattern [ | pattern ] ... ) list ;; ] ... esac
              A case command first expands word, and tries to match it against
              each pattern in turn, using the same matching rules as for path-
              name  expansion (see Pathname Expansion below).  When a match is
              found, the corresponding list  is  executed.   After  the  first
              match,  no subsequent matches are attempted.  The exit status is
              zero if no pattern matches.  Otherwise, it is the exit status of
              the last command executed in list -- man bash