# 20.18. Short Options

For convenience there are also single letter command-line option switches available for some parameters. They are described in Table 20.3. Some of these options exist for historical reasons, and their presence as a single-letter option does not necessarily indicate an endorsement to use the option heavily.

Table 20.3. Short Option Key

Short Option Equivalent
-B *x* shared_buffers = *x*
-d *x* log_min_messages = DEBUG*x*
-e datestyle = euro
-fb, -fh, -fi, -fm, -fn, -fo, -fs, -ft enable_bitmapscan = off, enable_hashjoin = off, enable_indexscan = off, enable_mergejoin = off, enable_nestloop = off, enable_indexonlyscan = off, enable_seqscan = off, enable_tidscan = off
-F fsync = off
-h *x* listen_addresses = *x*
-i listen_addresses = '*'
-k *x* unix_socket_directories = *x*
-l ssl = on
-N *x* max_connections = *x*
-O allow_system_table_mods = on
-p *x* port = *x*
-P ignore_system_indexes = on
-s log_statement_stats = on
-S *x* work_mem = *x*
-tpa, -tpl, -te log_parser_stats = on, log_planner_stats = on, log_executor_stats = on
-W *x* post_auth_delay = *x*