Useful psql commands:
How to start/quit the program
$ psql database_name: Start psql with database name.\q: Quit psql
General
\l: List all databases\dt: List tables/relations\d <table_name>: List info about a table
Display
\x: Turn on extended display (useful forselect * from <large_table>type queries or for fields with long fields.)\pset pager: Toggle pager (it gets annoying sometimes)\timing: Turn on/off query time display
Help
\h: Help on SQL Syntax\?: List psql slash commands