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原标题:Writing a bash script that modifies gcc c compiler

我愿写一下我自己的编目者指挥。 事实上,我只想在这种双面文字中使用电梯,而只是修改一个比照。

因此,我要有选择性的指挥,如帮助——反馈。 但是,我也希望有——只是把姓名作为强制性投入。 我如何这样做? 我想读一下——即档案名称。 但问题似乎在于我对任择和强制性参数的理解。 我如何区分这两者? 这里是我至今所写的法典(有许多人要看):

#!/bin/bash

for i in $@
do
case $i in
        -help)
                echo "This is how you use this command."
                ;;
        -backup)
                cp ./* ./backup
                ;;
        *)
                echo "Usage is this"
                exit
                ;;
esac
done
问题回答

由于你的论点之一期望有价值,你不能就<<>>for的参数发言。 使用<代码>$1和 临时

强制性参数为强制性变量设定了缺省(例如:空洞),如果它没有在规定参数之后确定,你知道它缺失。

而且,正如@etuardu所建议的,你可以使用getopt





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