Hi
I have over written "ls"command via "sudo cat > ls".That's why no executable file for "ls" was present.Finally I copied "ls" file from other computer and paste it in /bin and changed its mode to 755.
Its working now. 


On Mon, Nov 11, 2013 at 6:56 PM, Eric Blake <eblake@redhat.com> wrote:
On 11/10/2013 12:20 AM, sanjib dwibedy wrote:
>

[nothing in the body]

Sending screenshots and using only the subject line of your message to
convey contents is a poor way to express yourself.  It wastes a lot of
bandwidth (your message occupied 140 kb, even though pasting the
contents of your terminal session as text would be less than 1kb), and
not everyone is able to view images inline.

Have you checked whether you have any shell functions or aliases
interfering with normal operation?  Running 'type ls' will help you
determine if that may be the case.

--
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org