Getopts No Arguments, Bash provides the getopts built-in function to do just that.

Getopts No Arguments, This tutorial explains how to use the This shows the usage of getopts in bash scripts by parsing options with arguments and parsing options without arguments. Both "getopt" and getopts are tools to use for processing and validating shell script arguments. js. It is used to parse and validate the command-line arguments passed to your program at runtime. Parsing script or function options and non-option arguments is easy in Bash with getopts but there are some catches, such as the need to reset OPTIND. This module provides two functions and an exception: getopt. To inhibit automatic abbreviations for option words, use 'no_auto_abbrev'. 简介：这几个函数是对类似于main函数那样传进来的参数进行解析。 参数的指定由-key value -key --key value --key -key value1 value2 这几种类 简介：这几个函数是对类似于main函数那样传进来的参数进行解析。 参数的指定由-key value -key --key value --key -key value1 value2 这几种类 Instead, you call getopt in a loop, and it returns one option at a time until no more remain. This gives us a practical way to get "that missing feature" in getopts :) NOTE that nevertheless command-line options with optional args seems to be discouraged explicitly Guideline Conclusion getopts is a powerful tool for parsing command-line options in bash. I want to get the value of the arguments if they are present but if they are not present to use a default value.