how to protect file using password

[Carl Friis-Hansen]

jiten jha wrote:
> 
> Dear all,
>                I have a file i just want to protect it using password . 
> like when every one open that file that it is asking for password. tell 
> me the command prompt option and command also.
>  
> Thanks and Regard
> Jitendra Jha
> +91-9893325765

There are many possibilities. One is to archive it with password. 
Another is to use mcrypt, which is suggested here:
http://www.cyberciti.biz/tips/linux-or-unix-password-protecting-files.html
-- 
       +---------------------------------+-------------------+
       | Carl Friis-Hansen               | Fiskeryd Nybygget |
       | http://computingconfidence.com/ | 341 91  Ljungby   |
       | Phone: +46 (0)372 15033         | Sweden            |
       +---------------------------------+-------------------+