Linux 删除文件的最后一行
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Deleting last line of a file
提问by Shweta
I want to delete last line of a file on a particular condition. I used sed and cut but they work only on the output stream but I want to do this in the file. Can someone help me? Thanks in advance.
我想在特定条件下删除文件的最后一行。我使用了 sed 和 cut 但它们仅适用于输出流，但我想在文件中执行此操作。有人能帮我吗？提前致谢。
采纳答案by Shad
sed -ie '$d' filename.txt
The ioption tells sedto edit the file in place.
该i选项告诉sed在适当的位置编辑文件。
回答by alcoholtech
You can always do:
你总是可以这样做：
cat * > out
Where you could remove 'cat *' with whatever you're doing, and the out is the result of that command.
无论您在做什么，都可以删除“cat *”，而 out 是该命令的结果。
I can take a more thorough look if you provide more information on what you're trying to do.
如果您提供有关您要执行的操作的更多信息，我可以进行更彻底的研究。
回答by darklion
I'll use a variant on another answer and suggest a simple use of ed:
我将在另一个答案上使用一个变体，并建议简单使用 ed：
ed tmp.tmp << EOC
$
d
w
q
EOC
Otherwise you can use sed/cut to a temporary file and mvto overwrite the starting file.
否则，您可以使用 sed/cut 到临时文件并mv覆盖起始文件。
