Shell processing command-line options getopts

Getopts is a built-in command of the shell, typically used to handle shell command-line options, but cannot handle long options (such as--prefix=/home, etc.) directly.

Getopts has 2 parameters, the first parameter is a string, including the character and ":", each character is a valid option, if the character is followed by ":", indicating that the character has its own parameters. The second parameter is used to store the acquired options.

The shell provides 2 built-in variables for getopts:

Optarg: The parameters of the corresponding options are stored;

Optind: Stores the location of the next processing option in the original $*;

Instance:

#!/bin/bashecho $*while getopts  ": A:BC"  opt     #第一个冒号表示忽略错误do          case  $opt  in                 a )  echo  $OPTARG                      echo $ Optind;;                 b )   echo  "b  $OPTIND";;                 c )   echo  "c  $OPTIND";;                 ? )   echo  "Error"                      exit 1;;         esacdoneecho  $OPTINDshift  $ (($OPTIND  - 1)) #通过shift  $ (($OPTIND  - 1)), the $* only retains the parameters to remove the contents of the option, which can then be processed by normal shell programming. echo $0echo $*

Execute command:./getopts.sh-a 11-b-C
-A 11-b-C
11
3
B 4
C 5
5
./getopts.sh

Resources:

http://blog.csdn.net/li385805776/article/details/16981541

Shell processing command-line options getopts