Oracle - Start & Shutdown

Shell Command Start
# $ORACLE_HOME/bin/dbstart

Using Server Manager Start
# svrmgrl
SVRMGR> connect internal
SVRMGR> startup [ DBA | FORCE | SHARED | EXCLUSIVE ]

Shell Command Shutdown
# $ORACLE_HOME/bin/dbshut

Using Server Manager Shutdown
# svrmgrl
SVRMGR> connect internal
SVRMGR> shutdown [ normal | immediate | abort ]