删除最后一个字在bash中的每一行 [英] Delete last word in each line in bash

问题描述

我试图去通过文件，并删除每行的最后一个字。目前，我使用命令

I am trying to go through a file, and delete the last word in each line. Currently, I am using the command

sed 's/^*\n//' old.txt > new.txt

，但它是未来出old.txt相同new.txt。感谢您的帮助，让我知道如果我能澄清问题。此外，为了界定字我只是用空间。

but it is coming out that old.txt is the same as new.txt. Thanks for any help, and let me know if I can clarify the question. Also, in order to define 'word' I am just using spaces.

推荐答案

请尝试以下方法。 \\ W * 的最后一个字相匹配的文件和 $ 内部锚搜索到的行的末尾。

Try the following. \w* matches the last word inside of the file and $ anchors the search to the end of the line.

sed s/'\w*$'// old.txt > new.txt

之所以说是old.txt出来作为new.txt可能是因为你的常规的前pression ^ * \\ n 不匹配任何旧线.TXT。

The reason that old.txt is coming out as new.txt is likely because your regular expression ^*\n is not matching any lines in old.txt.

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