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i tried with ur solutions but i am unable to get it

if my file name is in $file variable and i need the file name with out the extension in one variable and the extension in another variable....

thanks for the help ..
but i have a small problem here
actually i need to create a new file with a name similar to the old file.

i.e. if the old file is abc.txt , the new file should be...

hi pludi,

i tried with sed cmd

sed 's/ABC/abc/g' $file1

but i can see the change only on cmd prompt but the in the file ABC is not replaced with abc.

hi ,

i am trying to search for a pattern in the file and then replace the pattern.

please guide me

Thanks,
Mahi