search n replace with multiple files in Vim

Suppose you have 100+ perl or C files and you want to replace 'xxx' with 'yyy' in all those files :

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$vim *.pl

:bufdo! s/xxx/yyy/g

:wall

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:wall -> save all.

same thing you can do with files opened in vim as in different windows.

:windo! s/xxx/yyy/g

other ways :

sed -i.bak -e 's/xxx/yyy/' *.pl ( with backup )

sed -i -e 's/xxx/yyy/' *.pl ( with no backup )

perl -p -i -e 's/xxx/yyy/g' *.pl ( careful no back up !! ).

Happy Vimming !!

@Satya