Replacing words in many files.

This one liner replaces one strnig in many files (all files named *.html), and saves a backup in *.bak.

perl  -e \'s/search/replace/gi\'  -p  -i.bak  *.html

Will this line also take subdirectories?

Yes.

(but only if you write */*.html or */*/*.html or what ever...)

Thanks I will test and comeback to close this case.

This did not work, I might be doing something wrong.
Lets put an example here.
I have a folder in LINUX called /home/mamon
and inside /home/mamon there are 100 files and other directories like this:

/home/mamon>
DirX
DirY
DirZ
fil1
fil2
fil3
fil4
fil5
...
...
...
fil100

As you can see the files do not have extension in linux.
In fil1 to fil100 it is writen \"I like rise\"
and I want to replace the word \"rise\" for \"fish\"
Inside the Directories DIRX DIRY and DIRZ there are also files with the same text which I also want to replace with \"fish\".

How can I do that?

Closing case due to unacceptable answer