How to pass arguments in postgres to sql scripts.

Hi friends,  Question: How to pass arguments in postgres to sql scripts. Context. When I am monitoring my production Oracle databases I have a lot of simple sql scripts (which require one or more arguments)  which make my monitoring/troubleshooting life simpler. How can I achieve the same in postgres? We are migrating our Oracle databases to Postgres  and I am modifying my scripts to do the same in Postgres.

Oracle
======
cat appjobcheck.sql

SELECT
    SID,
    SYS_CONTEXT.GET_CURRENT_SCHEMA() AS "SCHEMA", -- Similar to datname
    USERNAME,
    PROGRAM AS "APPLICATION_NAME",
    STATUS,
    SQL_ID, -- Use V$SQL to get full query text based on SQL_ID
    LOGON_TIME AS "BACKEND_START",
    SQL_EXEC_START AS "QUERY_START",
FROM
    V$SESSION
WHERE
    STATUS = 'ACTIVE' -- Filter to active sessions
    AND TYPE != 'BACKGROUND'; -- Exclude background processes
    AND program='&1';

The way to invoke from sqlplus is .

SQL> @appjobcheck batchprocessapp1  ---- batchprocessapp1 is what I want to monitor


Postgres
==========
cat appjobcheck.sql

SELECT
    pid,
    datname,
    usename,
    application_name,
    state,
    query,
    backend_start,
    query_start
FROM pg_stat_activity where application_name='&1';

The way I am trying invoke from postgres is .


postgres=> \i appjobcheck.sql batchprocessapp1  ---- batchprocessapp1 is what I want to monitor
 pid | datname | usename | application_name | state | query | backend_start | query_start
-----+---------+---------+------------------+-------+-------+---------------+-------------
(0 rows)

\i: extra argument "batchprocessapp1" ignored