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script to check db status in a server
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#!/bin/csh

setenv ORATAB /var/opt/oracle/oratab
date
foreach x (`cat ${ORATAB} | grep -v “^#”| grep “^[a-z]” | grep -v “demo” | grep -v “test”| grep -v “*” | awk -F:

‘{print $1}’`)
        setenv ORAENV_ASK 1
        setenv ORACLE_SID “$x”
        source /usr/local/default/oracle_sid.csh
            sqlplus -s <<EOF
        / as sysdba
        set lines 132 pages 200 hea off feedback off trims on
        col host_name for a20
                spool chk_dbstatus.log
        select instance_name, host_name, logins, version, status from v\$instance;
                spool off
        exit
EOF

Note: The above script is written using “C” shell, so if you are using any other shell, make necessary changes. Also as always first test it in lower environments