Linux OS launches Oracle database and listener with OS boot

[Email protected] hub]$ cat/etc/oratab# # This file was used by ORACLE utilities.  It is created by root.sh# and updated by either database Configuration Assistant while creating# a database or ASM Configu Ration Assistant while creating ASM instance.# A Colon, ': ', is used as the field terminator.  A New Line terminates# the entry.  Lines beginning with a pound sign, ' # ', is comments.## Entries is of the form:#   $ORACLE _sid: $ORACLE _home:<n| y>:## the first and second fields is the system identifier and home# directory of the database respectively.  The third filed indicates# to the Dbstart utility that the database should, "Y", or should not,# "N", being brought up at Sy Stem boot time.## multiple entries with the same $ORACLE _sid is not allowed.# #hub:/u01/app/oracle/product/11.2.0/dbhome_ 1:y

Linux OS launches Oracle database and listener with OS boot