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You should be able to open the vi utility by simply giving the absolute path:

# cd ~
# /bin/vi .bashrc

There isn't really much in .bashrc

# cat .bashrc

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
    . /etc/bashrc
fi

Actually  when i logged in with root user  then i am not able to use vi command

[reema@reema Desktop]$ vi /etc/oratab

[reema@reema Desktop]$ su

Password:

[root@reema Desktop]# vi /etc/oratab

bash: vi: command not found

[root@reema Desktop]#

But  with normal user i am able to use vi command

why ?

When you type "vi", the command line interpreter attempts to locate the path to the executable by walking through the directories defined by the PATH environment variable. If your PATH does not contain the directory where the program resides, you will have to specify the correct path instead, e.g.: /bin/vi. The PATH environment variable and other things are defined in the login scripts, such as .bashrc, /etc/profile, etc. and read depending on your type of shell. Note the difference between "su" and "su -". The later will perform a login and reset the current environment. You obviously screwed up the root login environment.

[root@localhost ~]# ls -al
total 36
dr-xr-x---.  2 root root 4096 Jan  3 00:00 .
drwxr-xr-x. 17 root root 4096 Jan  3 00:00 ..
-rw-------.  1 root root  903 Jan  2 21:43 anaconda-ks.cfg
-rw-------.  1 root root  525 Jan  3 01:24 .bash_history
-rw-r--r--.  1 root root   18 Apr 30  2014 .bash_logout
-rw-r--r--.  1 root root  176 Apr 30  2014 .bash_profile
-rw-r--r--.  1 root root  176 Apr 30  2014 .bashrc
-rw-r--r--.  1 root root  100 Apr 30  2014 .cshrc
-rw-r--r--.  1 root root  129 Apr 30  2014 .tcshrc
[root@localhost ~]# cat .bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
    . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH
[root@localhost ~]#

Yes u r right but what i found is in .bash_profile

I am setting in .bash_rc

export ORACLE_HOME=/u01/app/oracle/

product/11.2.0/dbhome_1
export PATH=$ORACLE_HOME/bin:$/u01/app/oracle/product/11.2.0/dbhome_1
export PATH

Is it my Path clashing am i right

in .bash_profile and .bash_rc