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Replace first 3 characters in a unix file in all lines

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# 1  
Old 10-03-2012
Replace first 3 characters in a unix file in all lines
Replace first 3 characters in a unix file (say replace "A&B" with "C&D") in all lines of the file. Need a sed or awk script to do this. Kindly help!

-Kumar
# 2  
Old 10-03-2012
Quote:
Originally Posted by vasan2815
Replace first 3 characters in a unix file (say replace "A&B" with "C&D") in all lines of the file. Need a sed or awk script to do this. Kindly help!

-Kumar
what have you tried so far and where exactly are you stuck?
# 3  
Old 10-03-2012
I need the command. Kindly help!
# 4  
Old 10-03-2012
Quote:
Originally Posted by vasan2815
I need the command. Kindly help!
You seem to be begging for code instead of help.
Please show your own effort first.
# 5  
Old 10-03-2012
Sir- With all due respect.Don't try to bully me. We are here to help each other. this is a forum. If you can't help , please do not post anything.I don't need your help by the way. So unkind of you for using unnecessary language in this forum.
I was just being courteous in asking.. so you don't deserve that respect?
This command is just going to help me modify the file which was written incorrectly. that's it. i am not going ot develop a bigger product out of this small thing. I am an already an expert in other languages/streams. My area of expertise is different. So don't humiliate others.
Sorry to type this big message.
lets end this thread right away.
thanks for your help.
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