Features

  1. non-interactive usage
  2. command history (up/down arrow)
  3. tab completion (sans Windows)
  4. commands terminate with semi-colon and can wrap lines
  5. defaults to supplying currently logged-in username as pg use

Tasks

  1. explore ‘psql’
    a. ‘psql –version’ returns version of postgresql client
    b. ‘psql -l -U postgres’ lists installed db’s then exits.
    postgreSQL installs 3 default db’s
    1. ‘postgres’ – management db. contains user accounts, global settings, etc
    2. ‘template0’ – vanilla read-only db
    3. ‘template1’ – changable copy of template0, used as template for new db’s
    c. ‘psql’ with no options enters interactive mode (duh)
    a hash-mark ending the interactive-prompt denotes a ‘superuser’ eg: ‘postgres=#’
    d. ‘\h’ – returns sql-specific help eg: ‘ALTER TABLE …’
    ‘\h create’ filters above to just ‘CREATE …’ commands
    e. ‘\?’ – returns ‘psql’ specific help eg: ‘\?’ ie: usable metasequences ie shortcuts
    f. ‘\l’ – returns list of DBs. ‘\l+’ additionally returns DB sizes
    g. ‘\du[+]’ – returns list of users with access to postgresql.
    h. ‘\!’ open shell from session (‘exit’ from shell = back to psql)
    i. ‘\! [command] – runs command in shell non-interactively and returns to psql.
    j. ‘\i filename’ – execute command(s) in the file ie psql or sql commands
    k, multiple commands can be run on one line. Separate with space, terminate with semi-colon (eg: ‘\l \du;’)
    L: ‘\c’ – connect to another database or host eg: ‘\c template1’
    m. ‘\d’ list tables\views etc in current DB, ‘\dS’ list system tables, ‘\dS+’ list system tables with sizes.
    n, \q quit
  2. c. ‘psql –help’ (or ‘psql -?’) psql option switches & defaults (short version then long version) eg: -U (username – short version), -l (list – short version), –version (long version) …

 

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