从sed的“S / C / D /'MYFILE到MyFile的输出重定向 [英] Redirect output from sed 's/c/d/' myFile to myFile
问题描述
我使用的sed脚本做替代,我想有替换的文件覆盖该文件。通常情况下,我认为你会使用这样的:
I am using sed in a script to do a replace and I want to have the replaced file overwrite the file. Normally I think that you would use this:
% sed -i 's/cat/dog/' manipulate
sed: illegal option -- i
不过,你可以看到我的SED没有该命令。
However as you can see my sed does not have that command.
我试过这样:
% sed 's/cat/dog/' manipulate > manipulate
但是,这只是变成操纵到一个空文件(有意义)。
But this just turns manipulate into an empty file (makes sense).
本作品:
% sed 's/cat/dog/' manipulate > tmp; mv tmp manipulate
但我想知道是否有输出重定向到该输入是取自同一文件的标准方法。
But I was wondering if there was a standard way to redirect output into the same file that input was taken from.
推荐答案
我通常使用的3号路,但有一个重要的变化
I commonly use the 3rd way, but with an important change:
$ SED的/猫/狗/'操纵> TMP和放大器;&安培; MV TMP操纵
即。变化;
到&放大器;&安培;
因此只有在发生的sed,此举是成功的;否则你会为你在你的sed语法做一个印刷工一旦失去了你的原始文件。
I.e. change ;
to &&
so the move only happens if sed is successful; otherwise you'll lose your original file as soon as you make a typo in your sed syntax.
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