08_02bash脚本编程之七-case语句及脚本选项进阶

2015-02-13

面向过程：

控制结构
顺序结构
选择结构
循环结构

1)


case: 
 case SWITCH in 
 value1) 
 statement 
 ... 
 ;; 
 value2) 
 statement 
 ... 
 ;; 
 *) 
 statement 
 ... 
 ;; 
 esac 


#!/bin/bash 
case $1 in  
[0-9]) 
 echo "a digit." 
 ;; 
[a-z]) 
 echo "lowercase letters" 
 ;; 
[A-Z]) 
 echo "capital letters" 
 ;; 
*) 
 echo "Special character" 
 ;; 
esac




#!/bin/bash 
case $1 in 
'start') 
 echo "start server..." 
 ;; 
'stop') 
 echo "stop server..." 
 ;; 
'restart') 
 echo "restart server..." 
 ;; 
'status')  
 echo "Runing..." 
 ;; 
*) 
 echo "`basename $0` {start|stop|restart|status}" 
esac

练习

写一个脚本，可以接受选项及参数，而后能够获取每一个选项，及选项的参数，并能根据选项及参数做出特定的操作，比如：

adminusers.sh –add tom,jerry –del tom,blair -v|–verbose -h|help


#!/bin/bash 
DEBUG=0 
ADD=0 
DEL=0 
for I in `seq 0 $#`;do 
if [ $# -gt 0 ];then 
case $1 in 
-v|--verbose) 
  DEBUG=1 
  shift 
  ;; 
  -h|help) 
 echo "Usage:`basename $0` --add USER_LIST --del USER_LIST -v|--verbose -h|help" 
 exit 0 
 ;; 
--add) 
 ADD=1 
 ADDUSERS=$2 
 shift 2 
 ;; 
--del) 
 DEL=1 
 DELUSERS=$2 
 shift 2 
 ;; 
*) 
 echo "Usage:`basename $0` --add USER_LIST --del USER_LIST -v|--verbose -h|help" 
 exit 7 
esac 
fi 
done 
if [ $ADD -eq 1 ];then 
 for USER in `echo $ADDUSERS | sed 's/,/ /g'`;do 
 if id $USER &>/dev/null ;then 
  [ $DEBUG -eq 1 ] && echo "$USER exited" 
 else 
 useradd -m $USER && echo $USER |passwd --stdin $USER &>/dev/null 
 [$DEBUG -eq 1 ] && echo "Add user $USER finished" 
 fi 
 done 
fi  
if [ $DEL -eq 1 ];then 
 for USER in `echo $DELUSERS | sed 's/,/ /g'`;do 
  if id $USER &>/dev/null;then 
    userdel -r $USER 
 [ $DEBUG -eq 1 ] && echo "Delete $USER finished" 
  else 
 [ $USER -eq 1 ] && echo "$USER not exist" 
  fi 
 done 
fi