ecpg, postgres: add pages

pages/common/ecpg.md

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+# ecpg
+
+> Embedded SQL preprocessor for C programs.
+> More information: <https://www.postgresql.org/docs/current/app-ecpg.html>.
+
+- Preprocess a specific file:
+
+`ecpg {{input.pgc}}`
+
+- Preprocess from `stdin` and output to `stdout`:
+
+`ecpg -o - -`
+
+- Preprocess from `stdin` and write to a file:
+
+`cat input.pgc | ecpg -o output.c -`
+
+- Preprocess and specify an output file:
+
+`ecpg -o {{output.c}} {{input.pgc}}`
+
+- Preprocess a header file (`.pgh` extension):
+
+`ecpg {{input.pgh}}`
+
+- Preprocess in a specific compatibility mode:
+
+`ecpg -C {{INFORMIX|INFORMIX_SE|ORACLE}} {{input.pgc}}`
+
+- Preprocess with autocommit enabled:
+
+`ecpg -t {{input.pgc}}`

pages/common/postgres.md

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+# postgres
+
+> Run the PostgreSQL database server.
+> More information: <https://www.postgresql.org/docs/current/app-postgres.html>.
+
+- Start the server on a specific port (defaults to 5432):
+
+`postgres -p {{5433}}`
+
+- Set a runtime parameter (short form):
+
+`postgres -c {{shared_buffers=128MB}}`
+
+- Set a runtime parameter (long form):
+
+`postgres --{{shared-buffers}}={{128MB}}`
+
+- Start in single-user mode for a specific database (defaults to the user name):
+
+`postgres --single -D {{path/to/datadir}} {{my_database}}`