Ok. The correct path appears to be:
/usr/local/var/lib/trisul/WEBTRISULDB.SQD
instead
/usr/local/var/lib/trisul/WEBTRISUL.SQDB
Thank you Vivek

/usr/local/bin/shell /usr/local/var/lib/trisul/WEBTRISUL.SQDB 'UPDATE TRISUL_WEB_USERS SET hash_password="d033e22ae348aeb5660fc2140aec35850c4da997" where id=1'
Error: no such table: TRISUL_WEB_USERS
/usr/local/bin/shell /usr/local/var/lib/trisul/WEBTRISULDB.SQDB 'UPDATE TRISUL_WEB_USERS SET hash_password="d033e22ae348aeb5660fc2140aec35850c4da997" where id=1'