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Replace two blank line with a single blank line

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# 1  
Old 09-14-2009
Replace two blank line with a single blank line
Hi Guys,

I have a file in which each set of records are separated by two blank line. I want to replace it with a single blank line.

Can you guys help me out?

Regards,
Magesh
# 2  
Old 09-14-2009
sed 's/ */ /g' file_name

This will replace 2 or more spaces to single space.
# 3  
Old 09-14-2009
Quote:
Originally Posted by mac4rfree
I have a file in which each set of records are separated by two blank line. I want to replace it with a single blank line.
Hi Magesh!
Try 'cat -s' probably it'll solve your problem
# 4  
Old 09-14-2009
Hope this helps you,

Input file:
1


2

3
4

5
6


7
8


9
10

Code:
$sed '/^$/{
N
/^\n$/s/^\n$//
}' a
1

2

3
4

5
6

7
8

9
10

# 5  
Old 09-14-2009
sidorenko ur soln was simple and effective thanks...

as well as urs skmdu..

Thanks Guys
# 6  
Old 09-14-2009
Or using awk
Code:
awk '!NF{getline;$0=(!NF)?$0:RS$0}1' file

# 7  
Old 09-14-2009
Or using Perl:

Code:
perl -lne 'if (/^$/ and $n==0){$n++; print} elsif(!/^$/){$n=0; print} else{$n++}' filename

tyler_durden
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