generate a (pseudo) random number in sh

Print a pseudo-random byte (hex) in sh:

cat /dev/urandom | od -t x1 -A n -N 1

->89

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Create a pseudo-random file of size 1 MB:

dd if=/dev/urandom of=a.log bs=1M count=1

Ref:

Re: generating random number in sh

http://linuxcommando.blogspot.com/2008/06/create-file-of-given-size-with-random.html