Shell Programming and Scripting

Have a doubt for the below code --

nawk '$1=$1' FS='\n' RS= ORS='\n\n' infile


In this code there is no print statement. Even then we get the output after running this script. How is that possible ?
Also did not get the meaning of the code '$1=$1' . What does it do exactly ?

I believe you meant explain.
It just transliterates the newlines to spaces inside the paragraphs:
the 0 switch with the 0 argument (-00) cause Perl to slurp files in paragraph mode
(one or more lines separated by one or more blank lines),
tr transliterates the \n to a space.

It's because in AWK the default action is print the current record:

Code:

% print OK|awk 42
OK

Quoting Ed Morton:

frankly speaking, I never worked in 'perl', hence unable to understand the code.
Is it possible for you to explain the code step by step?

Thanks.

Well,
in this case I believe you need something different.
You could start here.

Hi,
I forgot to ask, How this script will check whether the next line starts with word 'Type|' and if it is then should not merge with first row.

*When I ran the script, its concating both the lines mentioned below which should not happen. (these lines should not merge)

Type|Cash|TradeID|Funding Cash|SystemID|AA6192|SourceSystem|
Type|Cash|TradeID|Funding Cash|SystemID|BTB59029|SourceSystem|

OK,
please post a bigger sample of your real data that includes both cases.