Bash：用字符串操作（百分号）
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Bash: manipulating with strings (percent sign)
提问by musthero
What does a percent sign mean in bash when manipulating strings? For example, what does ${0%/*}mean?
操作字符串时，bash 中的百分号是什么意思？例如，是什么${0%/*}意思？
采纳答案by Ian Stapleton Cordasco
If you use @fedorqui's resource, you'll see it is going to strip the shortest match of /*from the end of the first positional argument. An example:
如果您使用@fedorqui 的资源，您会看到它将/*从第一个位置参数的末尾剥离最短的匹配项。一个例子：
example_foo(){
echo ${1%/*}
}
example_foo path/to/directory/sub_directory
# => path/to/directory
In the example I used the second positional argument since the first is the name of the function.
在示例中，我使用了第二个位置参数，因为第一个是函数的名称。
