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Regular Expression (sed editor)

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

0
alexgor
Asked:
alexgor
1 Solution
 
ahoffmannCommented:
sed -e 's/^\(.\)_/\1@/' a.txt

problems are:
  1. usage of quotes
  2. number of matched patter is \1 not \0
0
 
alexgorAuthor Commented:
Thank you very much.
0
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