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There's been a few times I've needed to create random numbers. Although I've done so in PERL, I've found Ruby is actually faster. This script generates 20 random "10" digit number NOT A RANDOM NUMBER. Replace 20 (1..20) with the amount of random numbers you need generated
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If you can do better, submit your command here.
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Even faster
echo $RANDOM
Apparently you need to learn to read. This generates a random 10 digit character not a random number
cat /dev/urandom | hexdump -d | awk '{ print $2$3}' | head -n20
the ruby is still faster ... cheers for choosing ruby