Shell command line parameter notes

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/shNAMEfalseAGEfalseODDfalseSEXfalsewhilegetopts: nao: s: argdocase $ arginn )... shell command line parameter note 1. getopts can write scripts to make it easier to control multiple command line parameters, such as 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.