case的用法

 
case "$1" in
     start)
          case "$UTC" in
               yes|true|1)
                    echo "Setting system clock..."
                    hwclock --hctosys --utc
                    evaluate_retval
                    ;;

               no|false|0)
                    echo "Setting system clock..."
                    hwclock --hctosys --localtime
                    evaluate_retval
                    ;;

               *)
                    echo "Invalid value for UTC in /etc/sysconfig/clock: $UTC"
                    echo "Valid values for UTC are 1 and 0."
                    exit 1
                    ;;
          esac
          ;;

     stop)
          case "$UTC" in
               yes|true|1)
                    echo "Updating hardware clock..."
                    hwclock --systohc --utc
                    evaluate_retval
                    ;;

               no|false|0)
                    echo "Updating hardware clock..."
                    hwclock --systohc --localtime
                    evaluate_retval
                    ;;

               *)
                    echo "Invalid value for UTC in /etc/sysconfig/clock: $UTC"
                    echo "Valid values for UTC are 1 and 0."
                    exit 1
                    ;;
          esac
          ;;

     *)
          echo "Usage: $0 {start|stop}"
          exit 1
          ;;
esac//結束標記

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