For convenience there are also single letter command-line option switches available for some parameters. They are described in Table 18-2. 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 18-2. Short Option Key
|-B x||shared_buffers = x|
|-d x||log_min_messages = DEBUGx|
|-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|
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