sed就地标志，可在Mac(BSD)和Linux上使用 [英] sed in-place flag that works both on Mac (BSD) and Linux

问题描述

是否调用了sed以进行就地编辑而无需备份，而该备份在Linux和Mac上都可以使用?虽然OS X附带的BSD sed似乎需要sed -i '' …，但GNU sed Linux发行版通常随附将引号解释为空的输入文件名(而不是备份扩展名)，而需要使用sed -i ….

Is there an invocation of sed todo in-place editing without backups that works both on Linux and Mac? While the BSD sed shipped with OS X seems to need sed -i '' …, the GNU sed Linux distributions usually come with interprets the quotes as empty input file name (instead of the backup extension), and needs sed -i … instead.

是否有任何两种语法都可以使用的命令行语法，所以我可以在两个系统上使用相同的脚本?

Is there any command line syntax which works with both flavors, so I can use the same script on both systems?

推荐答案

如果您真的只想简单地使用sed -i，那么以下方法在GNU和BSD/Mac sed上均可使用:

If you really want to just use sed -i the 'easy' way, the following DOES work on both GNU and BSD/Mac sed:

sed -i.bak 's/foo/bar/' filename

请注意缺少空格和点.

证明:

# GNU sed
% sed --version | head -1
GNU sed version 4.2.1
% echo 'foo' > file
% sed -i.bak 's/foo/bar/' ./file
% ls
file  file.bak
% cat ./file
bar

# BSD sed
% sed --version 2>&1 | head -1
sed: illegal option -- -
% echo 'foo' > file
% sed -i.bak 's/foo/bar/' ./file
% ls
file  file.bak
% cat ./file
bar

很显然，您可以删除.bak文件.

Obviously you could then just delete the .bak files.

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