substitude the pattern in vi
 

i just want to substitude the multiple pattenm, i mean two to three word simulteneously. i.e
linux==LINUX
UNIX==unics
kernel==core
i need this replacement in vi editor .

as we do :s/linux/LINUX/g
this is for only one pattern .similarly i need all three in one.It's great if you put the knowdge in vi editor.

Maybe you really want to use sed:

cat file1 | sed -e '1,$s/linux/LINUX/g' | \
sed -e '1,$s/kernel/core/g' >file2

vi is designed to give you quick visual feedback.

If you want to do programmatic large scale substitutions, try sed, awk, or perl.

yha , i need what u did here. but u had done in two substitution in the solution . but i need to do such many substitution in lot of time so it's not benificial for me .

e.g i want to convert some of character in the file from capital to small letter. so what method you had mention is not give the complete solution .

I'll second Jerre. You might look into writing a short sed script that you can modify as needed.

grymoire.com has some excellent tutorials, including one on sed.

it's really help full one
 

This document is really intersting one..also very much help full
thanks