How to display the function, procedure, triggers source code in postgresql?

Question

How to print functions and triggers sourcecode in postgresql? please let me know if any one know the query to display the function, triggers source code.

Answer 1

\sf function_name in psql yields editable source code of a single function.

From https://www.postgresql.org/docs/9.6/static/app-psql.html:

\sf[+] function_description This command fetches and shows the definition of the named function, in the form of a CREATE OR REPLACE FUNCTION command.

If + is appended to the command name, then the output lines are numbered, with the first line of the function body being line 1.