%perl script.pl 7 12 5

or

%perl script.pl < text.txt #where the contents of the text file are 7 12 5

##</code><code>##

if(@ARGV)
{ my @node_numbers= @ARGV}
else
{ my @node_numbers = do { local $/; split ' ', <> };}

if (!@node_numbers) 
{
print <<"EOF";
#####################################
#
#  use args or < a text file
# 
#####################################
EOF
die;
}

# Do rest of code after here using @node_numbers