This is the command pg_wrapper that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
pg_wrapper - wrapper for PostgreSQL client commands
SYNOPSIS
client-program [--cluster version/cluster] [...]
(client-program: psql, createdb, dropuser, and all other client programs installed in
/usr/lib/postgresql/version/bin).
DESCRIPTION
This program is run only as a link to names which correspond to PostgreSQL programs in
/usr/lib/postgresql/version/bin. It determines the configured cluster and database for the
user and calls the appropriate version of the desired program to connect to that cluster
and database, supplying any specified options to that command.
The target cluster is selected by the following means, in descending order of precedence:
1. explicit specification with the --host option
2. explicit specification with the --cluster option
3. if the PGHOST environment variable is set, no further cluster selection is performed.
The default PostgreSQL version and port number (from the command line, the environment
variable PGPORT, or default 5432) will be used.
4. explicit specification with the PGCLUSTER environment variable
5. matching entry in ~/.postgresqlrc (see postgresqlrc(5)), if that file exists
6. matching entry in /etc/postgresql-common/user_clusters (see user_clusters(5)), if that
file exists
7. If only one local cluster exists, that one will be selected.
8. If several local clusters exist, the one listening on the default port 5432 will be
selected.
If none of these rules match, pg_wrapper aborts with an error.
For psql, pg_archivecleanup, and pg_isready, pg_wrapper will always use the binary from
the newest PostgreSQL version installed, as these are downwards compatible.
OPTIONS
--cluster version/cluster
cluster is either the name of a local cluster, or takes the form host:port for a
remote cluster. If port is left empty (i. e. you just specify host:), it defaults to
5432.
ENVIRONMENT
PGCLUSTER
If $PGCLUSTER is set, its value (of the form version/cluster) specifies the desired
cluster, similar to the --cluster option. However, if --cluster is specified, it
overrides the value of $PGCLUSTER.
PG_CLUSTER_CONF_ROOT
This specifies an alternative base directory for cluster configurations. This is
usually /etc/postgresql/, but for testing/development purposes you can change this to
point to e. g. your home directory, so that you can use the postgresql-common tools
without root privileges.
PGSYSCONFDIR
This is the location of PostgreSQL's and postgresql-common's global configuration (e.
g. pg_service.conf, user_clusters(5)). The default is /etc/postgresql-common/.
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