?
Solved

Regular Expression (sed editor)

Posted on 2002-07-14
2
Medium Priority
?
329 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
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

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

This tech tip describes how to install the Solaris Operating System from a tape backup that was created using the Solaris flash archive utility. I have used this procedure on the Solaris 8 and 9 OS, and it shoudl also work well on the Solaris 10 rel…
Why Shell Scripting? Shell scripting is a powerful method of accessing UNIX systems and it is very flexible. Shell scripts are required when we want to execute a sequence of commands in Unix flavored operating systems. “Shell” is the command line i…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
Suggested Courses
Course of the Month14 days, 9 hours left to enroll

839 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