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
matches.

Note:  The command only search the EVENT table.  So it will only
display check-in comments or other comments that appear on an
unaugmented timeline.  It does not search document text or forum
messages.

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.

Options:

    -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.