What does the command do, &> filename?
 

Can anyone please reply the output of the command.

&> filename

It redirects the standard output and standard error of a command to a file. IOW, all the output that normally outputs on the terminal will go into "filename" instead.

It's not really a command though, because you don't run it on its own. It's a type of I/O redirection that you tack onto the end of a command when you launch it.

The link which you have provided is very useful for me.

Thanks a lot David.