16.03.18 【练习】case的用法 写一个脚本

写一个脚本，可以结合艘选项及参数，而后能获取每一个选项，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,blair --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

ADDUSER=$2

shift 2 ;;

--del)

DEL=1

DELUSER=$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 $ADDUSER | sed ‘s#,# #g‘`; do

if id $USER &> /dev/null; then

[ $DEBUG -eq 1 ] && echo "$USER exists"

else

useradd $USER

[ $DEBUG -eq 1 ] && echo "Add user $USER finished"

fi

done

fi

if [ $DEL -eq 1 ]; then

for USER in `echo $DELUSER | sed ‘s#,# #g‘`; do

if id $USER &> /dev/null; then

userdel -r  $USER

[ $DEBUG -eq 1 ] && echo "Delete $USER finished"

else

[ $DEBUG -eq 1 ] && echo "$USER not exists"

fi

done

fi