I changed the qx to qq and displayed the string as it is built. The result was exactly as I expected. I even cut and paste the generated string on the command prompt and it executed with the expected results. Here is the generated string: aml_read /l trace /h FTWAEIPD0001 /s "12/04/2000 07:00:00" /b "12/04/2000 08:00:00" /d all /appl commproc | egrep -c -e tty2

....Which once again should be generated from this:

$tty = qx{aml_read /l trace /h $_[3] /s $_[1]  /b $_[2] /d all /appl c
+ommproc | egrep -c -e $tty_string};
printf("<TR ALIGN=LEFT VALIGN=TOP>\n");
printf("<TD>%s</TD>\n",$tty_string);
chomp($tty);
printf("<TD>%d</TD>\n",$tty);
printf("</TR>\n");
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What is also weird is that I can hardcode the variables in the query and get the same results (although it seems to only work outside the loop). I suppose it is possible that I have more than one problem. One problem could be the qx line and the loop may also have errors.

Thanks Bryan