Oracle Database Discussions

Hi ,
i am trying to install oracle 10g on RHEL5 for the entire installation of operating system till database creatrion i followed the following link:

http://oracleflash.com/18/Install-Oracle-10g-Release-2-on-RHEL-5.html

http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-
on-linux-centos-and-automate-the-installation-using-linux-shell-script/

i hve installed oracle10g on rhel5 .............completed the installation my db got created and all the files are there...
but now on terminal iam using commands

exporrt ORACLE_SID=orcl
bash: sqlplus command not found

then later on when executed

vi .bsah_profile in that all the enteries related to
# Oracle settings
TMP=/tmp; export TMP
TMPDIR=$TMP; export TMPDIR

# If /tmp doesn't have 400mb space free then you can workaround it
# by pointing the variables TMP AND TMPDIR to a location where you
# have sufficient space. Oracle will then use this directory for
# temporary files.

ORACLE_BASE=/u01/app/oracle; export ORACLE_BASE
ORACLE_HOME=$ORACLE_BASE/product/10.2.0/db_1; export ORACLE_HOME
ORACLE_SID=orcl; export ORACLE_SID
ORACLE_TERM=xterm; export ORACLE_TERM
PATH=/usr/sbin:$PATH; export PATH
PATH=$ORACLE_HOME/bin:$PATH; export PATH

LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib;
export LD_LIBRARY_PATH
CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib;
export CLASSPATH

if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi

are not there .......... i hve inserted the entiers and even saved it but the next day the file is completely blank

and now if iam trying to execute logged in as oracle user
~/.bash_profile

it throws as
bash: /home/oracle/.bash_profile permission denied

while installing time i hve excueted
vi .bash_profile
add the enteries and save it with :wq

the next day the file is complety blank and if iam issuing
~/.bash_profile

it throws as
bash: /home/oracle/.bash_profile permission denied

i am very new to linux and commands related to oracle i google them understand and implement it but in case of
bash_profile iam getting a bit confused ........

i would have pasted the entire contents from terminal but i hcve done installation on VMWARE WORKSTATION 6.5 so in that case i am not able to paste it

kindly help .............

Thanks in advance ..............

Kavita