How to change the Owner of a file

Hi folks
Can any body tell me how to change the owner of a file ??????

I have written this script .......

unless (chown $uid , $gid , $filename)
{
die "chown failed :$!";
}

this code will give me the error you can't change " permission denied "
can any body tell me , how to over come this error

bye
rakesh

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