select sysdate from dual to prove it is up. but I cannot figure out how to do it

Try putting the SQL in a separate file.

#!perl
use strict;

open TMP,'>','~tmp.sql' or die "$!";
print TMP << 'END_OF_SQL';
SET HEADING OFF;
SELECT systimestamp || ' IP=' || sys_context('USERENV','IP_ADDRESS') 
FROM dual;
EXIT
END_OF_SQL
close TMP;

my $msg = `sqlplus -L -S USER/PASSWORD\@hostname \@~tmp.sql`;
print $msg;

unlink '~tmp.sql';

[download]
poj

In reply to Re: SQLPLUS connect database by poj
in thread SQLPLUS connect database by ytjPerl

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