passing a variable to cmd

[Jason Friedman]

>
> import subprocess
> import shlex
>
> domname = raw_input("Enter your domain name: ");
> print "Your domain name is: ", domname
>
> print "\n"
>
> # cmd='dig @4.2.2.2 nbc.com ns +short'
> cmd="dig @4.2.2.2 %s ns +short", % (domname)
> proc=subprocess.Popen(shlex.split(cmd),stdout=subprocess.PIPE)
> out,err=proc.communicate()
> print(out)
>
> The line that is commented out works fine.  However, I want to substitute
> a variable for "nbc.com".  The command:
>
> cmd="dig @4.2.2.2 %s ns +short", % (domname)
>
> does not work.  I've tried different variations to no avail.  Any advice
> on how to get that variable working?
>

Two things:
1) Please explain what "does not work" mean.  Are you getting an error
message?  If yes include the entire traceback.
2) The line /* cmd="dig @4.2.2.2 %s ns +short", % (domname) */ gives me a
syntax error.  Please copy-and-paste the exact commands you are entering.