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Please answer the questions raised by Peasant.



All sed command operate on the pattern space; hold space is just a bucket for intermediate storage. Your code snippet swaps the line just read...

Can you please be more precise and note your operating system with shell details.
Offer an example of your problem and/or make better wording.

Regards
Peasant.

The a becomes a_a
The following bc remains unchanged.

The abc is passed to sed.
The sed substitutes a by a_a.
& is what matched, and the a matches an a.