Linux 如何替换而不在sed中创建中间文件？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6889360/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to substitute without creating intermediate file in sed?
提问by kingsmasher1
I was doing some hands-on with the Unix sedcommand. I was trying out the substitution and append command, in a file. But the difficulty is, I have to create an intermediate file, and then do mvto rename it to the original file.
我正在使用 Unixsed命令进行一些实践。我正在一个文件中尝试替换和追加命令。但困难是，我必须创建一个中间文件，然后mv将其重命名为原始文件。
Is there any way to do it at one shot in the same file?
有没有办法在同一个文件中一次性完成？
[root@dhcppc0 practice]# sed '1i\
> Today is Sunday
> ' file1 > file1
[root@dhcppc0 practice]# cat file1
[root@dhcppc0 practice]#
The file is deleted!
文件被删除！
[root@dhcppc0 practice]# sed 's/director/painter/' file1 > file1
[root@dhcppc0 practice]# cat file1
The file is deleted!
文件被删除！
采纳答案by Marcus Borkenhagen
GNU sed knows an option -iwhich does in-placeedit of the given files.
GNU SED知道一个选项，-i这确实就地给定文件的编辑。
When doing an operation file1 > file1what actually happens is, that the file is openedand truncatedby the shell beforethe program (which gets it's name as argument) comes around reading anything from it.
在执行操作时file1 > file1，实际发生的情况是，在程序（将其名称作为参数）读取文件之前，shell打开并截断了该文件。
Update:
更新：
sed's man page states the following on the -ioption (thanks Delan for mentioning it):
sed 的手册页在-i选项中说明了以下内容（感谢 Delan 提到它）：
-i[SUFFIX], --in-place[=SUFFIX] edit files in place (makes backup if extension supplied)
-i[SUFFIX], --in-place[=SUFFIX] edit files in place (makes backup if extension supplied)
回答by rorycl
sed -i.bak 's/director/painter/' file1
sed -i.bak 's/director/painter/' file1
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if extension supplied)
回答by dawnofthedead
Try this -
尝试这个 -
sed -i '' 's/originaltext/replacementtext/g' filename | cat filename
-i '' is meant for providing a backup file. If you are confident your replacement won't cause an issue you can put '' to pass no backup file
-i '' 用于提供备份文件。如果您确信您的替换不会引起问题，您可以将 '' 设置为不传递备份文件
/g is for replacing globally. If you have more than one originaltext in one line then with /g option will replace all else it will only replace the first.
/g 用于全局替换。如果一行中有多个原文，则使用 /g 选项将替换所有其他文本，它只会替换第一个。
