psql help

[Murthy Nunna]

Hello:

Following works-

    SELECT pid, pg_terminate_backend(pid) FROM pg_stat_activity
    WHERE pid IN (select unnest(pg_blocking_pids(pid)) from pg_stat_activity 
where cardinality(pg_blocking_pids(pid)) > 0)
                 and usename = 'DBUSER_10'
                 and now() - state_change >= interval $a'${TIMEOUT_MINS}'$a
                 order by now() - state_change >= interval 
$a'${TIMEOUT_MINS}'$a desc limit 1;

How can I rewrite the above in psql and pg_terminate_backend  all pids that 
meet above criteria (essentially remove limit 1) ?

Thanks!

Note:
I run this in Linux. TIMEOUT_MINS is env variable.