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Regular Expression (sed editor)

Posted on 2002-07-14
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Last Modified: 2010-05-18
Hello !

I have following file, called for example "a.txt"

f_a
m_b

Now I want to replace each first character at a line followed by "_", by the same character followed by "@",
in other words I wish to receive following file.

f@a
m@b

It's important for me to execute the upper task using sed editor, and I do it in the following way:

>> sed s/"^(.)_"/"\0@"/ a.txt > b.txt

But for any reason this command doesn't work.

Can you please explain what is a problem.

Txs,
Alex

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Question by:alexgor
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ahoffmann earned 100 total points
ID: 7152593
sed -e 's/^\(.\)_/\1@/' a.txt

problems are:
  1. usage of quotes
  2. number of matched patter is \1 not \0
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by:alexgor
ID: 7152608
Thank you very much.
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