Command Not Found Error?

Linux and Unix-Like Red Hat
1

Hi,
I am beginer to Linux. I have installed Redhat Linux AS 4.0 on my System.Later I created a User Oracle10g for Installing Oracle.Then I logged onto Oracle10g user and crated a Bash Profile and when I run that profile there was an error in that Profile. from then If I type any of Linux Command like LS, PWD etc i am getting an error like Command not found.
So Please help me out with this. I will be very greateful to you..

2

And you are using lower case for the commands right?

try typing
/bin/ls

and

/bin/pwd

if that works then the PATH is not set.

3

pwd is a builtin and should work even if the PATH is not set.