shell 中利用getopts

[[email protected] shell]# cat getopts.sh

#!/bin/bash

#date=2014-09-16

#is to practice  the getopts

while getopts "a:bc" arg(:前面的变量是一定要跟参数的）

do

case $arg in

a)

echo "a‘s arg:$OPTARG"

;;

b)

echo "b"

;;

c)

echo "c"

;;

?)

echo "unkown argument"

exit1

;;

esac

done

[[email protected] shell]# ./getopts.sh -b

b

[[email protected] shell]# ./getopts.sh -c

c

[[email protected] shell]# ./getopts.sh c

[[email protected] shell]# ./getopts.sh -a /root/

a‘s arg:/root/

如果不加参数的话会报错的。

[[email protected] shell]# ./getopts.sh -a

./getopts.sh: option requires an argument -- a

unkown argument

./getopts.sh: line 18: exit1: command not found