Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Regular Expression (sed editor)

Posted on 2002-07-14
2
Medium Priority
?
327 Views
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

0
Comment
Question by:alexgor
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 51

Accepted Solution

by:
ahoffmann earned 400 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
0
 

Author Comment

by:alexgor
ID: 7152608
Thank you very much.
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In tuning file systems on the Solaris Operating System, changing some parameters of a file system usually destroys the data on it. For instance, changing the cache segment block size in the volume of a T3 requires that you delete the existing volu…
Using libpcap/Jpcap to capture and send packets on Solaris version (10/11) Library used: 1.      Libpcap (http://www.tcpdump.org) Version 1.2 2.      Jpcap(http://netresearch.ics.uci.edu/kfujii/Jpcap/doc/index.html) Version 0.6 Prerequisite: 1.      GCC …
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question