标签：sed

然而同样的命令，如果放到mac下面，就会报：sed: 1: "xxx.txt": invalid command code o

到stackoverflow.com就会发现已经有人回复了：https://stackoverflow.com/questions/19456518/invalid-command-code-despite-escaping-periods-using-sed

If you are on a OS X, this probably has nothing to do with the sed command. On the OSX version of sed, the -i option expects an extension argument so your command is actually parsed as the extension argument and the file path is interpreted as the command code.

Try adding the -e argument explicitly and giving '' as argument to -i:

find ./ -type f -exec sed -i '' -e "s/192.168.20.1/new.domain.com/" {} \;
See this.

所以上面的代码就改为：sed -i '' -e 's/xxx/yyy/g' xxx.txt ，搞定

参考：

1、https://stackoverflow.com/questions/19456518/invalid-command-code-despite-escaping-periods-using-sed

2、https://stackoverflow.com/questions/7573368/in-place-edits-with-sed-on-os-x

单一文件重命名就太简单了，mv一下就全来了。批量怎么办？

OK，一句话：

for i in `ls`; do mv -f $i `echo $i | sed 's/????/?????/'`; done

看到没。其实就是一个for in，然后 mv 一下。只是mv的蚨，用sed进行了改名，用上了管道，echo 等。

接着来：

1、改文件的首字母为a：

for i in `ls`; do mv -f $i `echo $i | sed 's/^./a/'`; done

2、改文件的末字母为a

for i in `ls`; do mv -f $i `echo $i | sed 's/.$/a/'`; done

3、文件名加前缀：

for i in `ls`; do mv -f $i `echo "prefix_"$i`; done

4、文件名小写变大写

for i in `ls`; do mv -f $i `echo $i | tr a-z A-Z`; done

顾名思议，大写变小写就是将A-Z和a-z换一个位置

5、改指定字符为其他（如后缀名）

for i in `ls`; do mv -f $i `echo $i | sed 's/.html/.php/'`; done

更多技巧，请参考sed的用法