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Insert blank line in a file

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# 1  
Old 05-04-2010
Insert blank line in a file
I have a file with data as below :

Code:
Heading 1
-------------
Heading 1 data1
Heading 1 data2
Heading 1 data3
Heading 1 data4
Heading 2
-------------
Heading 2 data1
Heading 2 data2
Heading 2 data3
Heading 2 data4
Heading 3
-------------
Heading 3 data1
Heading 3 data2
Heading 3 data3
Heading 3 data4

I want to insert a blank line after each set of Heading.
ie; The data should look as below.
Code:
Heading 1
-------------
Heading 1 data1
Heading 1 data2
Heading 1 data3
Heading 1 data4

Heading 2
-------------
Heading 2 data1
Heading 2 data2
Heading 2 data3
Heading 2 data4

Heading 3
-------------
Heading 3 data1
Heading 3 data2
Heading 3 data3
Heading 3 data4

How can we do this using awk/sed.
We can use --- for pattern search if required.

Thanks
Last edited by vgersh99; 05-04-2010 at 08:07 AM.. Reason: code tags, please!
# 2  
Old 05-04-2010
Code:
awk 'NR>1 && NF==2 {print RS $0; next}1' infile

# 3  
Old 05-04-2010
Thanks alot ! This works fine !
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