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Yes @peasent Sir,
My operating system is ubuntu.

Ok,
Example is
In a file content are

a
b
c
d


sed 'x;p;x' filename

How x will work?

How to work x in sed command?
I know x command is swaps the contents of pattern space and hold space. But i am unable to understand it's working?

Thanks alot Sir.

But the output is a_abc
Why?

I don't understand this command behavior.
echo "abc" |sed 's/a/&_&/'