# 18.18\. 短選項 為了方便起見，這里還為一些參數提供了好多單字母命令行選項開關。 它們在下面的[Table 18-2](#calibre_link-1549)里描述。 其中一些選項僅僅是因為歷史原因而存在的，盡管它們是單字母選項， 但是并不表示它們很常用。 **Table 18-2\. 短選項鍵字** | 短選項 | 等效 | | --- | --- | | `-A` `_x_` | `debug_assertions =` `_x_` | | `-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_` |