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# assume $lname, $tempfile were assigned previously
my $command = "unix_blues -w $lname >> $tempfile";
...
# the above puts the output into $tempfile and the return code in $rc
# they then open, read the tempfile putting lines into array (which co
+uld have  
# also been done in one line)

my $command = "unix_blues -w $lname";
@BluesData = `$command`;