那位帮忙解释一下下面的code

jason680

回复 1# KEN6503

1. search getopts in CU

2. study basic skill
shell基础二十篇
http://bbs.chinaunix.net/thread-452942-1-1.html
shell 十三問?
http://bbs.chinaunix.net/thread-218853-1-1.html

shell基础学习第二十篇-向脚本传递参数
http://bbs.chinaunix.net/thread-1823335-1-1.html


   

jason680

回复 3# KEN6503

The getopts function check for options, you need check argument by yourself with $1 after shift

please refer below:

$ ./t.sh -f abc
file is : abc
abc
didn't get the argument

$ ./t.sh -f abc 1 2 3
file is : abc
abc

$ ./t.sh -f abc -a 1 2 3
file is : abc
abc
error

$ ./t.sh
didn't get the argument

$ cat t.sh
#!/bin/bash
while getopts :f: arg
do
        case $arg in
                f) echo file is : $OPTARG
#                        shift; shift
                        echo $OPTARG;;
  
                \?) echo "error"
        esac
done
while ((++n < OPTIND)); do shift; done

if [ "$1" == "" ]; then
   echo "didn't get the argument"
   exit
fi