Try:
# hostname <hostname> hostname
<hostname> is the for the name you want to give to the machine without  
< > signs.

Abhi.

Arnav Kalra wrote:
> Any recommendations?
>
> Regards,
> Arnav Kalra
> 104, Sector 14
> Karnal - 132001
> Mobile - +91 9896961018
> Home - +91 184 4030104
>
>
>
> On Wed, May 2, 2012 at 11:13 PM, Luke Teyssier 
> <[log in to unmask] <mailto:[log in to unmask]>> wrote:
>
>     Dear Arnav,
>
>      
>
>     Please consider investing in a good Linux System administration book.
>
>      
>
>     Regards
>
>      
>
>     *From:* [log in to unmask]
>     <mailto:[log in to unmask]>
>     [mailto:[log in to unmask]
>     <mailto:[log in to unmask]>] *On
>     Behalf Of *Arnav Kalra
>     *Sent:* Wednesday, May 02, 2012 10:42 AM
>     *To:* Tam Nguyen
>     *Cc:* [log in to unmask]
>     <mailto:[log in to unmask]>
>     *Subject:* Re: How do i change hostname?
>
>      
>
>     ok. i will edit the file now.
>
>     Regards,
>     Arnav Kalra
>     104, Sector 14
>     Karnal - 132001
>     Mobile - +91 9896961018 <tel:%2B91%209896961018>
>     Home - +91 184 4030104 <tel:%2B91%20184%204030104>
>
>
>     On Wed, May 2, 2012 at 11:11 PM, Tam Nguyen <[log in to unmask]
>     <mailto:[log in to unmask]>> wrote:
>
>     Which instruction did you follow? 
>
>     To permanently change your hostname that will survive the reboot,
>     you will have to edit the file /etc/sysconfig/network. 
>
>      
>
>     the command:
>
>     $ hostname lappy
>
>     is just a temporary change.
>
>      
>
>     On Wed, May 2, 2012 at 1:36 PM, Arnav Kalra
>     <[log in to unmask] <mailto:[log in to unmask]>> wrote:
>
>     Yahoo. It has changed. When i reboot will i get the hostname as
>     lappy or that dhcppc stuff?
>
>
>
>     Regards,
>     Arnav Kalra
>     104, Sector 14
>     Karnal - 132001
>     Mobile - +91 9896961018 <tel:%2B91%209896961018>
>     Home - +91 184 4030104 <tel:%2B91%20184%204030104>
>
>
>     On Wed, May 2, 2012 at 11:04 PM, Tam Nguyen <[log in to unmask]
>     <mailto:[log in to unmask]>> wrote:
>
>     If you don't want to reboot your computer, then become root and
>     type this:
>
>     [arnav@dhcppc1 ~]$ hostname lappy
>
>      
>
>     then exit your terminal and open a new terminal. 
>
>      
>
>     The actual file to change your hostname is:
>
>     [arnav@dhcppc1 ~]$ vi /etc/sysconfig/network
>
>      
>
>     If you edited file /etc/sysconfig/network, then you need to reboot
>     your computer.
>
>      
>
>      
>
>      
>
>      
>
>      
>
>