shell编程（caseparam）

[root@linux4  ]# cat caseparam
#!/bin/sh
#caseparam
if [ $# != 1 ]; then
  echo "Usage:'basename $0'[start|stop|help]" >&2
  exit 1
 fi
# assign the parameter to the variable OPT
OPT=$1
 case $OPT in
 start) echo "starting~~`basename $0`"
 #code here to start a process
 ;;
 stop) echo "stopping~~ `basename $0`"
 #code here to stop a process
 ;;
help)
 #code here to dispaly a help page
;;
 *)echo "Usage:`basename $`[start|stop|help]"
;;
esac
[root@linux4  ]# ./caseparam start
starting~~caseparam
[root@linux4  ]# ./caseparam stop
stopping~~ caseparam
[root@linux4  ]# ./caseparam help
[root@linux4  ]#