alias to replace a text in file

here is a practical situation.I facing some of my files where there is a common string in these files.I usually will open vi and do some thing like

:%s/text/replacement/g

and I have to do it in many files many many times.
Is there some easy way to do it or some sort of alias that I can create for the same?

You can use find for finding the target files and then pipe it to sed:

find | xargs sed -i ‘s/foo/bar/g’

Only replace in .txt files:

find . -name “*.txt” -print | xargs sed -i ‘s/foo/bar/g’

(from this blog post)

Check more discussion of this question.

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