macos - OS X Terminal: tr: how to add multiple carriage returns?

Question

I have a file that is formatted like this:

> ABC
1
2
> DEF
3
4

I would like to use tr to replace each > with 4 carriage returns, so it looks like:

 ABC
1
2




 DEF
3
4

I tried the following in the Terminal: cat input | tr ">" "\n\n\n\n" > output However, this only adds one carriage return between the two blocks of data, like this:

 ABC
1
2

 DEF
3
4

How can I get it to recognize the multiple carriage returns? Thanks!

Answer 1

tl;博士

tr 是错误的工作工具；尝试别的东西（比如 sed）

---

tr （文本替换）仅进行 1:1 替换 - 因此它一次只会替换一个字符。我认为您当前的命令将 > 替换为 /n，>> 替换为 /n/n，>>> 替换为 /n/n/n，>>>> 替换为 /n/n/n/n。

尝试使用 sed 代替，可能是这样的（未经测试！）：

cat input | sed $'s/>/\\\n\\\n\\\n\\\n/g' > output