> Btw, what does the 'perl -wpi.bak' do in the following?
>
> perl -wpi.bak -e 'tr{abc def ghi jkl mno prs tuv wxy}
> {222 333 444 555 666 777 888 999}'
-w warnings
-pi.bak filter file(s), saving old file(s) as *.bak.
By filter file(s), I mean do the bit after the -e to each
line in each of the file(s) listed on the command line
after the given command.
perl -pi -e 's/foo/bar/g' myfiles.*
is a canonical perl one-liner that replaces every
foo with bar in the files myfiles.*. Try it - but not
on important files until you know what you are
doing and/or create backups by specifying a
backup extension after the -i.
