使用 Bash 从包名中剥离版本
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strip version from package name using Bash
提问by cd1
I'm trying to strip the version out of a package name using only Bash. I have one solution but I don't think that's the best one available, so I'd like to know if there's a better way to do it. by better I mean cleaner, easier to understand.
我正在尝试仅使用 Bash 从包名称中删除版本。我有一个解决方案，但我认为这不是最好的解决方案，所以我想知道是否有更好的方法来做到这一点。更好我的意思是更清晰，更容易理解。
suppose I have the string "my-program-1.0" and I want only "my-program". my current solution is:
假设我有字符串“my-program-1.0”，而我只想要“my-program”。我目前的解决方案是：
#!/bin/bash
PROGRAM_FULL="my-program-1.0"
INDEX_OF_LAST_CHARACTER=`awk '{print match(# Using your matching criterion (first hyphen with a number after it
PROGRAM_NAME=$(echo "$PROGRAM_FULL" | sed 's/-[0-9].*//')
# Using a stronger match
PROGRAM_NAME=$(echo "$PROGRAM_FULL" | sed 's/-[0-9]\+\(\.[0-9]\+\)*$//')
, "[A-Za-z0-9]-[0-9]")} <<< $PROGRAM_FULL`
PROGRAM_NAME=`cut -c -$INDEX_OF_LAST_CHARACTER <<< $PROGRAM_FULL`
actually, the "package name" syntax is an RPM file name, if it matters.
实际上，“包名”语法是一个 RPM 文件名，如果重要的话。
thanks!
谢谢！
采纳答案by Cascabel
Pretty well-suited to sed:
非常适合 sed：
program_full="my-program-1.0"
program_name=${program_full%-*} # remove the last hyphen and everything after
The second match ensures that the version number is a sequence of numbers separated by dots (e.g. X, X.X, X.X.X, ...).
第二个匹配确保版本号是由点分隔的数字序列（例如 X, XX, XXX, ...）。
Edit: So there are comments all over based on the fact that the notion of version number isn't very well-defined. You'll have to write a regex for the input you expect. Hopefully you won't have anything as awful as "program-name-1.2.3-a". Absent any additional request from the OP though, I think all the answers here are good enough.
编辑：因此，基于版本号的概念不是很明确这一事实，到处都有评论。您必须为您期望的输入编写一个正则表达式。希望你不会有像“program-name-1.2.3-a”那样糟糕的东西。虽然没有来自 OP 的任何额外要求，但我认为这里的所有答案都足够好。
回答by Paused until further notice.
Bash:
重击：
program_full="alsa-lib-1.0.17-1.el5.i386.rpm"
program_name=${program_full%%-[0-9]*} # remove the first hyphen followed by a digit and everything after
Produces "my-program"
制作“我的程序”
Or
或者
$ echo my-program-1.0 | perl -pne 's/-[0-9]+(\.[0-9]+)+$//'
my-program
Produces "alsa-lib"
产生“alsa-lib”
回答by Jon Ericson
How about:
怎么样：
##代码##