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# NAME
osm2pgsql-gen - Generalize OpenStreetMap data - EXPERIMENTAL!
# SYNOPSIS
**osm2pgsql-gen** \[*OPTIONS*\]...
# DESCRIPTION
THIS PROGRAM IS EXPERIMENTAL AND MIGHT CHANGE WITHOUT NOTICE!
**osm2pgsql-gen** reads data imported by **osm2pgsql** from the database,
performs various generalization steps specified by a Lua config file and
writes the data back to the database. It is used in conjunction with and
after **osm2pgsql** and reads the same config file.
This man page can only cover some of the basics and describe the command line
options. See the [Generalization chapter in the osm2pgsql
Manual](https://osm2pgsql.org/doc/manual.html#generalization) for more
information.
# OPTIONS
This program follows the usual GNU command line syntax, with long options
starting with two dashes (`--`). Mandatory arguments to long options are
mandatory for short options too.
# MAIN OPTIONS
-a, \--append
: Run in append mode. The default is to run in create mode.
-S, \--style=FILE
: The Lua config file. Same as for **osm2pgsql**. Usually not required
because it is read from the `osm2pgsql_properties` table.
-j, \-jobs=NUM
: Specifies the number of parallel threads used for certain operations.
Setting this to the number of available CPU cores is a reasonable starting
point. Minimum value and default is 1, maximum value is 256.
# HELP/VERSION OPTIONS
-h, \--help
: Print help.
-V, \--version
: Print osm2pgsql version.
# LOGGING OPTIONS
\--log-level=LEVEL
: Set log level ('debug', 'info' (default), 'warn', or 'error').
\--log-sql
: Enable logging of SQL commands for debugging.
# DATABASE OPTIONS
-d, \--database=NAME
: The name of the PostgreSQL database to connect to. If this parameter
contains an `=` sign or starts with a valid URI prefix (`postgresql://` or
`postgres://`), it is treated as a conninfo string. See the PostgreSQL
manual for details.
-U, \--username=NAME
: Postgresql user name.
-W, \--password
: Force password prompt.
-H, \--host=HOSTNAME
: Database server hostname or unix domain socket location.
-P, \--port=PORT
: Database server port.
\--schema=SCHEMA
: Default for various schema settings throughout osm2pgsql-gen
(default: `public`). The schema must exist in the database and be writable
by the database user. It must be the same as used with `osm2pgsql`.
\--middle-schema=SCHEMA
: Database schema where the `osm2pgsql_properties` table is to be found.
Default set with `--schema`. Set to the same value as on the `osm2pgsql`
command line.
# SEE ALSO
* [osm2pgsql website](https://osm2pgsql.org)
* [osm2pgsql manual](https://osm2pgsql.org/doc/manual.html)
* **postgres**(1)
* **osm2pgsql**(1)
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