linux bash，用破折号分隔的驼峰式字符串
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linux bash, camel case string to separate by dash
提问by armandfp
Is there a way to convert something like this:
有没有办法转换这样的东西：
MyDirectoryFileLine
to
到
my-directory-file-line
I found some ways to convert all letters to uppercase or lowercase, but not in that way; any ideas?
我找到了一些将所有字母转换为大写或小写的方法，但不是那样；有任何想法吗？
回答by dogbane
You can use s/\([A-Z]\)/-\L\1/gto find an upper case letter and replace it with a dash and it's lower case. However, this gives you a dash at the beginning of the line, so you need another sed expression to handle that.
您可以使用s/\([A-Z]\)/-\L\1/g查找大写字母并将其替换为破折号，并且它是小写的。但是，这会在行的开头给您一个破折号，因此您需要另一个 sed 表达式来处理它。
This should work:
这应该有效：
sed --expression 's/\([A-Z]\)/-\L/g' \
--expression 's/^-//' \
<<< "MyDirectoryFileLine"
回答by 4ndrew
I propose to use sed to do that:
我建议使用 sed 来做到这一点：
NEW=$(echo MyDirectoryFileLine \
| sed 's/\(.\)\([A-Z]\)/-/g' \
| tr '[:upper:]' '[:lower:]')
UPDI forget to convert to lower case, updated code
UPD我忘记转换为小写，更新代码
回答by eumiro
echo MyDirectoryFileLine | perl -ne 'print lc(join("-", split(/(?=[A-Z])/)))'
prints my-directory-file-line
印刷 my-directory-file-line
回答by bilalq
None of the solutions posted here worked for me. Most didn't support multiple platforms well. The one from @4ndrew was close, but it failed on edge cases that had multiple capitalized characters next to each other (example: FooMVPClientturns into foo-mv-pclientinstead of foo-mvp-client).
这里发布的所有解决方案都不适合我。大多数都不能很好地支持多个平台。来自@4ndrew 的那个很接近，但它在具有多个大写字符彼此相邻的边缘情况下失败（例如：FooMVPClient变成foo-mv-pclient而不是foo-mvp-client）。
This worked for me:
这对我有用：
echo "MyDirectoryMVPFileLine" \
| sed 's/\([a-z]\)\([A-Z]\)/-/g' \
| sed 's/\([A-Z]\{2,\}\)\([A-Z]\)/-/g' \
| tr '[:upper:]' '[:lower:]'
output:
输出：
my-directory-mvp-file-line
回答by Peter
Slight variation on @bilalq's answer that covers some more possible edge cases:
@bilalq 的回答略有不同，涵盖了更多可能的边缘情况：
echo "MyDirectoryMVPFileLine" \
| sed 's/\([^A-Z]\)\([A-Z0-9]\)/-/g' \
| sed 's/\([A-Z0-9]\)\([A-Z0-9]\)\([^A-Z]\)/-/g' \
| tr '[:upper:]' '[:lower:]'
output is still:
输出仍然是：
my-directory-mvp-file-line
but also:
但是也：
WhatADeal -> what-a-deal
TheMVP -> the-mvp
DoSomeABTesting -> do-some-ab-testing
The3rdThing -> the-3rd-thing
The3Things -> the-3-things
ThingNumber3 -> thing-number-3
回答by KARASZI István
With GNUsed:
使用GNUsed：
echo "MyDirectoryFileLine"|sed -e 's/\([A-Z]\)/-\L/g'
You just need to strip the first dash if that's bothers you:
如果这让您感到困扰，您只需要去掉第一个破折号：
echo "MyDirectoryFileLine"|sed -e 's/\([A-Z]\)/-\L/g' -e 's/^-//'
With BSDsed it it's a bit longer:
使用BSDsed 它会更长一点：
echo "MyDirectoryFileLine"|sed -e 's/\([A-Z]\)/-/g' -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/' -e 's/^-//'
Update: the BSD version will work with the GNU version, so I recommend using the latter.
更新：BSD 版本将与 GNU 版本一起使用，因此我建议使用后者。
回答by potong
This might work for you:
这可能对你有用：
<<<"MyDirectoryFileLine" sed 's/[A-Z]/-\l&/g;s/.//'
my-directory-file-line
