China DOS Union

For example, I have a text file a.txt under d:\ad\, and the content is as follows:

This is a dos
a - dos bat.
like bat

output: ok
Now I need to replace the blank lines between line 2, line 3 and line 4 with "join us". How to handle it? Thanks!

[ Last edited by mailmail on 2009-5-4 at 23:41 ]

What you said is about blank lines or spaces?

a DOS batch file.
Like a batch file
Add the following blank line, all replaced with one sentence

I'm sorry, I made a mistake. It should be a direct carriage return and line feed, that is, an empty line with nothing in it, which is equivalent to taking the following text content

This is a dos
a - dos bat.
like bat

output: ok
Change to the following form
This is a dos
join us.
output: ok

I have found relevant examples in the forum and saw how to replace a certain line
http://www.cn-dos.net/forum/viewthread.php?tid=35759&fpage=1
But what if I want to replace multiple lines into one line? That is, set string multiple times?
Also, what if there are blank lines among multiple lines, how to replace them?

It is generally better to handle it with a regular expression find and replace tool.

fr -rnnlic:"like bat\r\n\r\n" -t:"join us\." a.txt

FR download:
http://baiy.cn/utils/fr/index.htm

Thanks! This is for learning. Because it's used in the company, external new commands can't be used. If not using this, can we only use loop statements to replace one by one?

Originally posted by yishanju at 2009-5-4 11:51 PM:
It is generally better to use a regular expression find-and-replace tool for processing.

fr -rnnlic:"like bat\r\n\r\n" -t:"join us\." a.txt

FR download:
http://baiy.cn/utils/fr/index.htm

This also has issues and cannot handle processing in a loop. If "like bat" is after a blank line, it cannot find the "like bat" field and process it.

Also, it seems that Brother Yishanju is very proficient in the regular expressions of fr. Why not open a special section to specifically elaborate on it? I looked at Bai Yang's website, which only has rules but lacks example explanations, making it very confusing for beginners.

[ Last edited by pkto on 2009-10-22 at 20:40 ]