The thl tail command can be used to view a live stream of THL as it is either being generated by an extractor, or received on a replica from an upstream extractor.

On its own, the command will output the THL entry, as shown in the following example:

shell> thl tail
SEQ# = 13 / FRAG# = 0 (last frag)
- FILE = thl.data.0000000001
- TIME = 2023-02-02 14:23:27.0
- EPOCH# = 7
- EVENTID = mysql-bin.072822:0000000000034499;68
- SOURCEID = centos1
- METADATA = [mysql_server_id=1000;mysql_thread_id=68;dbms_type=mysql;tz_aware=true;is_metadata=true;service=alpha;shard=tungsten_alpha;heartbeat=NEW5]
- TYPE = com.continuent.tungsten.replicator.event.ReplDBMSEvent
- OPTIONS = [##charset = UTF-8, autocommit = 1, sql_auto_is_null = 0, foreign_key_checks = 1, unique_checks = 1, time_zone = 'SYSTEM', sql_mode = 'NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,IGNORE_SPACE', character_set_client = 33, collation_connection = 33, collation_server = 255]
- SCHEMA = tungsten_alpha
- SQL(0) = UPDATE tungsten_alpha.heartbeat SET source_tstamp= '2023-02-02 15:23:27.845', salt= 5, name= 'NEW5'  WHERE id= 1

With the addition of the -sql switch, the command will output just the SQL statements, as shown in the following example:

shell> thl tail -sql
/* seqno: 11, fragno: 0 (last), epoch: 7, 2023-02-02 14:07:18.0, mysql-bin.072822:0000000000033589;65, centos1 */
/* SEQ# = 11 - SQL rendering of row change events is not supported */

/* seqno: 12, fragno: 0 (last), epoch: 7, 2023-02-02 14:07:57.0, mysql-bin.072822:0000000000034044;67, centos1 */
USE tungsten_alpha;
UPDATE tungsten_alpha.heartbeat SET source_tstamp= '2023-02-02 15:07:57.108', salt= 4, name= 'NEW5'  WHERE id= 1;

In both instances, output to the screen will continue until CTRL+C is pressed.