## 20.18. Short Options

For convenience there are also single letter command-line option switches available for some parameters. They are described in Table 20.2. 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 20.2. 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``