The "search" command:
Usage: fossil search [-all|-a] [-limit|-n #] [-width|-W #] pattern...
Search for timeline entries matching all words provided on the
command line. Whole-word matches scope more highly than partial
Outputs, by default, some top-N fraction of the results. The -all
option can be used to output all matches, regardless of their search
score. The -limit option can be used to limit the number of entries
returned. The -width option can be used to set the output width used
when printing matches.
-a|--all Output all matches, not just best matches.
-n|--limit N Limit output to N matches.
-W|--width WIDTH Set display width to WIDTH columns, 0 for
unlimited. Defaults the terminal's width.