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Reads from the null special file always return end of file (i.e., read(2) returns 0), whereas reads from zero always return bytes containing zero (\0 characters).
null and zero are typically created by:
mknod -m 666 /dev/null c 1 3
mknod -m 666 /dev/zero c 1 5
chown root:root /dev/null /dev/zero