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How to replace partial of string in file?

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# 1  
Old 06-20-2013
How to replace partial of string in file?
Hi Guys,

I need replace part of string in a file.
for example:
Code:
ABC=123
CDE=122
DEF=456
ABC=123
DED=333
ABC=123

I need replace the value after ABC=, highlighted in red. I want to get following result;
Code:
ABC=456
CDE=122
DEF=456
ABC=456
DED=333
ABC=456

Anybody can help me this.

Thanks in advance.
# 2  
Old 06-20-2013
For example

Code:
sed 's/ABC=.*/ABC=456/' inputfile

# 3  
Old 06-20-2013
Code:
sed 's/\(ABC=\).*/\1456/g' file

ABC=456
CDE=122
DEF=456
ABC=456
DED=333
ABC=456

This User Gave Thanks to in2nix4life For This Post:
ken6503
# 4  
Old 06-20-2013
Quote:
Originally Posted by in2nix4life
Code:
sed 's/\(ABC=\).*/\1456/g' file

ABC=456
CDE=122
DEF=456
ABC=456
DED=333
ABC=456

This code works. Thanks
Smilie
# 5  
Old 06-20-2013
Be aware that since none of the solutions anchor their regular expression, if your real data can contain keys/names that are substrings of others, they might modify more lines than intended.

Regards,
Alister
This User Gave Thanks to alister For This Post:
ken6503
# 6  
Old 06-20-2013
Using Perl one-liner
Code:
%perl -pe "s/ABC=\d{3}/ABC=456/g" file

Code:
ABC=456
CDE=122
DEF=456
ABC=456
DED=333
ABC=456

This User Gave Thanks to Fundix For This Post:
ken6503
# 7  
Old 06-20-2013
Thanks for you guys reply my question. all methods are work.
I have one more question. I need get value from another file and replace the current file.
I tried
Code:
sed 's/\(ABC=\).*/\`cat oldfile`/g' file

it didn't work.
How can I fix this?

Thanks in advance.
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