bash 使用 sed 在 linux 上进行文本替换（从文件读取并保存到同一文件）
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Text substitution (reading from file and saving to the same file) on linux with sed
提问by Roger
I want to read the file "teste", make some "find&replace" and overwrite "teste" with the results. The closer i got till now is:
我想读取文件“teste”，做一些“查找和替换”并用结果覆盖“teste”。我现在离得越近是：
$cat teste
I have to find something
This is hard to find...
Find it wright now!
$sed -n 's/find/replace/w teste1' teste
$cat teste1
I have to replace something
This is hard to replace...
If I try to save to the same file like this:
如果我尝试像这样保存到同一个文件：
$sed -n 's/find/replace/w teste' teste
or:
或者：
$sed -n 's/find/replace/' teste > teste
The result will be a blank file...
结果将是一个空白文件...
I know I am missing something very stupid but any help will be welcome.
我知道我错过了一些非常愚蠢的东西，但欢迎任何帮助。
UPDATE: Based on the tips given by the folks and this link: http://idolinux.blogspot.com/2008/08/sed-in-place-edit.htmlhere's my updated code:
更新：根据人们提供的提示和此链接：http: //idolinux.blogspot.com/2008/08/sed-in-place-edit.html这是我更新的代码：
sed -i -e 's/find/replace/g' teste
回答by geekosaur
On Linux, sed -iis the way to go. sedisn't actually designed for in-place editing, though; historically, it's a filter, a program which edits a stream of data in a pipeline, and for this usage you would need to write to a temporary file and then rename it.
在 Linux 上，sed -i是要走的路。 sed不过，它实际上并不是为就地编辑而设计的；从历史上看，它是一个过滤器，一个编辑管道中数据流的程序，对于这种用法，您需要写入一个临时文件，然后重命名它。
The reason you get an empty file is that the shell opens (and truncates) the file before running the command.
得到空文件的原因是 shell 在运行命令之前打开（并截断）了该文件。
回答by Antti
You want: sed -i 's/foo/bar/g' file
你要： sed -i 's/foo/bar/g' file
回答by Scott C Wilson
You want to use "sed -i". This updates in place.
您想使用“sed -i”。这更新到位。
回答by Gjorgji Tashkovski
In-place editing with perl
使用 perl 进行就地编辑
perl -pi -w -e 's/foo/bar/g;' file.txt
or
或者
perl -pi -w -e 's/foo/bar/g;' files*
for many files
对于许多文件
回答by glenn Hymanman
The edsolution is:
该ed解决方案是：
ed teste <<END
1,$s/find/replace/g
w
q
END
Or without the heredoc
或者没有heredoc
printf "%s\n" '1,$s/find/replace/g' w q | ed teste
回答by limtete
Actually, if you use -iflag, sedwill copy the original line you edit.
实际上，如果您使用-i标志，sed将复制您编辑的原始行。
So this might be a better way:
所以这可能是一个更好的方法：
sed -i -e 's/old/new/g' -e '/new/d' file
