Thank you Kindly!!!

The following worked 
        my $PSQL = q{psql -p 5555 mcdb -c \"update ev_cus_prof set act
+ive='f' where epid='INIT_EV_HIGH_PRIORITY';\"};
        system(qq{su - admin -c "$PSQL"});

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In reply to Re^4: processing PSQL with system command by g_speran
in thread processing PSQL with system command by g_speran

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