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How to search for multiple lines and put them into one paragraph?

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Top Forums Shell Programming and Scripting How to search for multiple lines and put them into one paragraph?
# 8  
Old 11-28-2010
Quote:
Originally Posted by cabrao
@scrutinizer

Can you please explain your command ?
Code:
'!NF{p=0}p{$1=$1;print}/^ \(/{p=1}'

Sure.

!NF{p=0}If the line is empty (there are no fields) then the end of the block is reached (var p becomes 0)
p{$1=$1;print}if the block is to be printed then reformat the record (line) by assigning a value to one of the fields and then print the line. One of the effects is that leading spaces are removed..
/^ \(/{p=1} if the line contains a space followed by a an opening parenthesis then the next line is the start of the block, so make p=1
ORS= Use "" as the output record separator so that the newlines are removed and lines are joined
This User Gave Thanks to Scrutinizer For This Post:
cabrao
# 9  
Old 11-28-2010
I guess it's clear even if p{$1=$1;print} seems peculiar to me...

Thanks scrutinizer Smilie
# 10  
Old 11-28-2010
You're welcome. If p=1 then the part in curly brackets gets executed. $1=$1 is a way of applying formatting with OFS as field separator... (See https://www.unix.com/shell-programming-scripting/148216-view-ouput-file.html#7, perhaps I explained it more clearly there.)
# 11  
Old 11-28-2010
@scrutinizer:
Thanks for your answer again. One more thing, can p{$1=$1;print} be "read" like if p is true then print $1=$1 ?

I followed your previous link and I understand your command but why can we do $2=$2, $3=3 etc but not $0=0 ?
# 12  
Old 11-28-2010
Almost, it can be read like if p is true then $1=$1 and then print $0.
Second question: because $0 signifies the record itself, not one of the fields...
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