The DEFINE command in SQLPlus is used to display or set substitution variables
SQL> def
DEFINE _DATE = "17-FEB-25" (CHAR)
DEFINE _CONNECT_IDENTIFIER = "db19c" (CHAR)
DEFINE _USER = "SYS" (CHAR)
DEFINE _PRIVILEGE = "AS SYSDBA" (CHAR)
DEFINE _SQLPLUS_RELEASE = "1903000000" (CHAR)
DEFINE _EDITOR = "vi" (CHAR)
DEFINE _O_VERSION = "Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0" (CHAR)
DEFINE _O_RELEASE = "1903000000" (CHAR)
SQL>
SQL> !ps -ef | grep pmon
oracle 3792 1 0 20:55 ? 00:00:00 ora_pmon_db19c
oracle 7275 7263 0 23:40 pts/2 00:00:00 /bin/bash -c ps -ef | grep pmon
oracle 7277 7275 0 23:40 pts/2 00:00:00 grep pmon
SQL> !ps -ef | grep smon
oracle 3834 1 0 20:55 ? 00:00:00 ora_smon_db19c
oracle 7280 7263 0 23:40 pts/2 00:00:00 /bin/bash -c ps -ef | grep smon
oracle 7282 7280 0 23:40 pts/2 00:00:00 grep smon
[oracle@db19c ~]$ ps -ef | grep pmon
oracle 12305 1 0 Mar05 ? 00:00:00 ora_pmon_db19c
oracle 12749 12136 0 00:01 pts/0 00:00:00 grep --color=auto pmon
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