How to start/stop oracle database from linux command prompt

How to start/stop oracle database from linux command prompt:-
[oracle@configsrv1 ~]$vi /etc/oratab
#

# This file is used by ORACLE utilities.  It is created by root.sh
# and updated by the Database Configuration Assistant when creating
# a database.

# A colon, ':', is used as the field terminator.  A new line terminates
# the entry.  Lines beginning with a pound sign, '#', are comments.
#
# Entries are of the form:
#   $ORACLE_SID:$ORACLE_HOME:<N|Y>:
#
# The first and second fields are 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", be brought up at system boot time.
#
# Multiple entries with the same $ORACLE_SID are not allowed.
#
#
prim:/u01/app/oracle/product/11.2.0/db_1:N

change the entry to this

prim:/u01/app/oracle/product/11.2.0/db_1:Y

and save the file.

For starting db
[oracle@configsrv1 ~] dbstart
ORACLE_HOME_LISTNER is not SET, unable to auto-start Oracle Net Listener
Usage: /u01/app/oracle/product/11.2.0/db_1/bin/dbstart ORACLE_HOME
Processing Database instance "prim": log file /u01/app/oracle/product/11.2.0/db_1/startup.log

To fix the above error;

[oracle@configsrv1 ~]export ORACLE_HOME_LISTNER=$ORACLE_HOME
[oracle@configsrv1 ~]dbstart $ORACLE_HOME
Then start the db again
[oracle@configsrv1 bin]$ dbstart $ORACLE_HOME
Processing Database instance "prim": log file /u01/app/oracle/product/11.2.0/db_1/startup.log

For stopping db
[oracle@configsrv1 ~] dbshut