┌ In OpenIndiana : there is a mlocate package.
You just need to install it :

pkg install mlocate

- Indexing all folders and files

updatedb

- Perform a search

locate FILE

┌ In OmniOSce : there is no locate package in core/extra repositories, you need to set up pkgsrc repository first.

- Install pkgsrc repository
You must install pkgsrc repository first.
See another letter

- Open a terminal and switch to root

su -

- Install findutils

pkgin -y in findutils

- Indexing all folders and files

updatedb

- Perform a search

locate FILE