Before you can use it, you have to source the db2profile script into your shell.
From the shell command-line, do this:
db2 list db directorydb2 connect to ALIAS (where ALIAS is whatever alias that appeared in the first command)db2 list tables for allTo list all tables, sorted by number of records:
db2 "SELECT tabschema CONCAT '.' CONCAT tabname AS table_name, card AS rows FROM syscat.tables ORDER BY card"
If you've started it in interactive mode, you can simply type ? for help.