"No such variable" in Expect scripts

I am curious if anyone knows how to get this to work.

Example.
linenum=`grep -n /home/abc.com /etc/httpd/conf/httpd.conf | awk -F: '{print 
$1;exit}'`

On the command line it always works, but in an expect script it always 
errors out stating that the $1 is not a variable.

can't read "1": no such variable
   while executing
"send -- "linenum=`grep -n /home/$domain /etc/httpd/conf/httpd.conf | awk 
-F: '{print $1;exit}'`\r""
   (file "./rmdomain.exp" line 43)

I think the following id the same problem.  I'm trying to get the $timestamp 
variable to be used when backing up the configuration files prior to 
changing them, but it gives the same type of error message from the 
following code.

send -- "timestamp=`date +%Y%m%d%H%M%S`\r"
expect -exact "\[root@cgi root\]# "
send -- "cp /etc/vsftpuser.chroot_list 
/etc/backup/vsftpuser.chroot_list$timestamp\r"
expect -exact "\[root@cgi root\]# "

Also, the expect script slows down half way thru.  I do have "sleep 1" 
commands in it to make sure that the passwd command doesn't get over run, 
but not the rest of it because they are straight commands like grep, cat, 
cp, etc.

Any help would be appreciated.

Jim

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