Setting: URLM_TRIM_LOG

Manually trim the log file, according to the urlm_max_log_lines and
urlm_max_log_age settings (q.v.)

Normally you won't need this command: instead you'll use the
urlm_log_trim_startup and/or urlm_log_trim_interval settings to
automatically keep the log size manageable. /urlm_trim_log might be
useful for recovering from an attack by floodbots that send URLs
to a channel...