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How to print text between two pattern in one line?

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# 1  
Old 07-06-2011
Data How to print text between two pattern in one line?
Hello all,

I have one input file like this:
Code:
List 1
mail a
mail b
mail c

List 2
mail d
mail e
mail f
mail g

List 3
mail h
mail i

And I want something like that by using linux:
Code:
List 1,mail a,mail b,mail c
List 2,mail d,mail e,mail f,mail g
List 3,mail h,mail i

Do you have any idea how I'm suppose to do it?
Last edited by Franklin52; 07-06-2011 at 11:06 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 07-06-2011
Code:
awk '{gsub("\n",",")}1' RS= file

This User Gave Thanks to bartus11 For This Post:
benitto
# 3  
Old 07-06-2011
Thank you Bartus11!
Also can you explain a little beat this command?
# 4  
Old 07-06-2011
RS= sets record separator to empty line, so each of those blocks of lines is treated by AWK as separate record. Now in each of those blocks gsub("\n",",") is replacing newline characters to commas. 1 at the end tells AWK to print resulting records.
# 5  
Old 07-06-2011
Many thanks Bartus11,
Have a nice day!
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