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19.18. Short Options
For convenience there are also single letter command-line option switches available for some parameters. They are described in Table 19.2. 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 19.2. Short Option Key
| Short Option | Equivalent | 
|---|---|
-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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 https://www.postgresql.org/docs/10/runtime-config-short.html