bash grep ‘随机匹配’细绳
有没有办法通过 bash 从文本文件中获取“随机匹配”字符串？
我目前正在通过 bash、curl & 获取下载链接。 grep 来自在线文本文件。
示例：
DOWNLOADSTRING="$(curl -o - "http://example.com/folder/downloadlinks.txt" | grep "$VARIABLE")"
来自在线文本文件，其中
http://alphaserver.com/files/apple.zip
http://alphaserver.com/files/banana.zip
$VARIABLE 是用户选择的内容。
效果很好，但我想在文本文件中添加一些镜像。
因此，当选择变量“banana”时，我 grep 包含的文本文件：
http://alphaserver.com/files/apple.zip
http://betaserver.com/files/apple.zip
http://gammaserver.com/files/apple.zip
http://deltaserver.com/files/apple.zip
http://alphaserver.com/files/banana.zip
http://betaserver.com/files/banana.zip
http://gammaserver.com/files/banana.zip
http://deltaserver.com/files/banana.zip
代码应选择随机“banana”字符串并将其存储为“DOWNLOADSTRING”变量。 上面的当前代码只能处理文本文件中的 1 个字符串，因为它捕获所有“banana”。
这是做什么用的；我想为在线文本文件中的文件添加一些镜像下载链接，但当前代码不允许这样做。
我可以让 grep 抓取一个随机的“banana”字符串吗？ （而且不是全部）
Is there a way to grab a 'random matching' string via bash from a text file?
I am currently grabbing a download link via bash, curl & grep from a online text file.
Example:
DOWNLOADSTRING="$(curl -o - "http://example.com/folder/downloadlinks.txt" | grep "$VARIABLE")"
from online text file which contains
http://alphaserver.com/files/apple.zip
http://alphaserver.com/files/banana.zip
where $VARIABLE is something the user selected.
Works great, but i wanted to add some mirrors to the text file.
So when the variable 'banana' is selected, text file which i grep contains:
http://alphaserver.com/files/apple.zip
http://betaserver.com/files/apple.zip
http://gammaserver.com/files/apple.zip
http://deltaserver.com/files/apple.zip
http://alphaserver.com/files/banana.zip
http://betaserver.com/files/banana.zip
http://gammaserver.com/files/banana.zip
http://deltaserver.com/files/banana.zip
the code should pick a random 'banana' string and store it as the 'DOWNLOADSTRING' variable.
the current code above can only work with 1 string in the text file, since it grabs everything 'banana'.
What this is for; i wanted to add some mirror downloadlinks for the files in the online text file, and the current code doesn't allow that.
Can i let grep grab one random 'banana' string? (and not all of them)
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请参阅此问题以了解如何在 grep 之后获取随机行。
rl似乎是一个不错的候选人在 Unix 命令行中从文件中读取随机行的简单方法是什么？
然后执行
grep ... | RL |头 -n 1See this question to see how to get a random line after grep.
rlseems like a good candidateWhat's an easy way to read random line from a file in Unix command line?
then do a
grep ... | rl | head -n 1试试这个：
输出将被随机排序，然后第一行将被选择。
Try this:
The output will be random-sorted and then the first line will be selected.
如果
mirrors.txt具有您在问题中提供的以下数据：那么您可以使用以下命令从文件中获取随机“匹配的字符串”：
然后您可以将其存储为变量
DOWNLOADSTRING，方法是使用函数调用设置其值，如下所示：这将根据用户的
${VARIABLE}< 从文本文件中为您提供专用的随机行/代码> 输入。这样打字就少了很多。If
mirrors.txthas the following data, which you provided in your question:Then you can use the following command to get a random "matched string" from the file:
Then you can store it as the variable
DOWNLOADSTRINGby setting it's value with a function call like so:This will give you a dedicated random line from the text file based on the user's
${VARIABLE}input. It is a lot less typing this way.