The itox command is wrong. This one will work:
echo -e "9999\t\tstream\ttcp\tnowait\tapprox\t/usr/sbin/approx\t/usr/sbin/approx" | itox
The itox command is wrong. This one will work:
echo -e "9999\t\ tstream\ ttcp\tnowait\ tapprox\ t/usr/sbin/ approx\ t/usr/sbin/ approx" | itox