"Recoll consists mainly of program/client 'recoll' and the
program/daemon recollindex. The latter is responsible for indexing
files and can be run as a daemon for indexing files in real time.
Depending on the distribution you may also find 'recollq', which is
the client command line. Once launched, the client Recoll warns you
to proceed with its configuration before starting the indexing.
Click on 'cancel' otherwise it will indexes all your personal
folder. In the window that appears enter the folders and subfolders
that you want to index by selecting the button '+' (remember to
remove '~'with the '-'). Click 'OK' and Recoll will start with the
indexing of files in these folders. At the end try to find one or
more files that contain a particular word or phrase and instantly
you'll get the search result. For future indexing by hand simply
select 'Update Index' from the 'File' menu."