so the command instructs evince to open on the specified page and highlight/move to the first occurrence of the word
from
http://manpages.ubuntu.com/manpages/wily/man1/evince.1.html--page-index=NUMBER
Open the document on the page with the specified page index
(this is the exact page number, not a page label).
--find=string
You can pass a word or phrase here. If it exists, evince will
display the document and the first match.
in "user preferences"-> "choose editor applications" i can use okular here, but cannot get the same functionality which is very important (i have had to install evince for this single use case!)
since you have documentation and application (evince) to benchmark, I assume this is clear?
Nicholas