Shell Command Line Parameter notes

Source: Internet
Author: User

Shell Command Line Parameter Note 1. getopts can write scripts to make it easier to control multiple command line parameters, for example, file get. sh #! /Bin/shNAME = falseAGE = falseODD = falseSEX = false while getopts: nao: s: arg do case $ arg in n) echo 'name is true';) echo 'Age is true'; o) echo 'oss is '$ OPTARG; s) echo 'sex is' $ OPTARG; *) echo 'default ';; esac done uses getopts to set the n, a, o, and s options, so that sh get. sh-n directly outputs name is true. Therefore, getopts provides command parameters. To pass a value after a parameter, add ":" After the parameter, such as na: OS: When you select a parameter, the system will ask you to provide the value; otherwise, a warning will be given: get. sh: option requires an argument -- o is actually a parameter. If you do not want to prompt this warning or use your own prompt, add ":" Before naos to have the value yes, we should use $ OPTARG to get the value we entered, and when we set the options, we should try to use the same system options to ensure that they meet everyone's normal usage habits.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.