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Shell Programming and Scripting

Replace & sign to &amp word

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# 1  
Old 11-23-2010
Replace & sign to &amp word
Hi, I have text file abc.txt. In this file, I have the following data.

Input:
Code:
Mr Smith &amp Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith& Mrs Smith
Mr Smith &Mrs Smith

Output:
Code:
Mr Smith &amp Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith &amp Mrs Smith
Mr Smith&amp Mrs Smith
Mr Smith &ampMrs Smith

In line 3, 4, and 5. I want to change & sign to &amp word but do not want to change anything in line 1, and line 2. If I use

Code:
sed 's/&/&amp/g' abc.txt

command, it changes to &amp everywhere.

Thanks for your help

Naveed

Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 11-23-2010 at 12:03 PM.. Reason: code tags, please!
# 2  
Old 11-23-2010
Code:
sed 's/&\([^a-z]\)/\&amp\1/g' abc.txt

# 3  
Old 11-23-2010
Thanks a lot jlliagre. It works great.

Naveed
# 4  
Old 11-24-2010
Code:
sed '2,$s/&/&aa/'

# 5  
Old 11-24-2010
Huh ?
Your code give that output:
Code:
Mr Smith &amp Mrs Smith
Mr Smith &aaapos Mrs Smith
Mr Smith &aa Mrs Smith
Mr Smith&aa Mrs Smith
Mr Smith &aaMrs Smith

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