mac下用sed报错 command c expects \ followed by text
一条很简单的替换文本的命令：sed -i 's/www.a.cn/www.b.com/g' common.js，报错command c expects \ followed by text
但是同样的命令在服务器上是可以正确执行的，看了mac下的man sed，里面-i选项中的解释：
Edit files in-place, saving backups with the specified extension.
If a zero-length extension is given, no backup will be saved.It
is not recommended to give a zero-length extension when in-place
editing files, as you risk corruption or partial content in situ-
ations where disk space is exhausted, etc.
大概的意思就是说用-i的选项时mac会进行强制备份，所以你必须给出一个后缀名进行备份，如果你不想进行备份，直接用空字符即可
sed -i '' 's/www.a.cn/www.b.com/g' common.js
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