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Don't use PSQL_WATCH_PAGER when stdin/stdout are not a terminal. This corresponds to the restrictions on when other commands will use [PSQL_]PAGER. There isn't a lot of sense in trying to use a pager in non-interactive cases, and doing so allows an environment setting to break our tests. Also, ignore PSQL_WATCH_PAGER if it is set but empty or all-blank, for the same reasons we ignore such settings of [PSQL_]PAGER (see commit 18f8f784c). No documentation change is really needed, since there is nothing suggesting that these constraints on [PSQL_]PAGER didn't already apply to PSQL_WATCH_PAGER too. But I rearranged the text a little to make it read more naturally (IMHO anyway). Per report from Pavel Stehule. Back-patch to v15 where PSQL_WATCH_PAGER was introduced. Discussion: https://postgr.es/m/CAFj8pRDTwFzmEWdA-gdAcUh0ZnxUioSfTMre71WyB_wNJy-8gw@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.