lines from a file or random numbers
reads lines from the standard input and
copies them to the standard output with a probability of 1/denominator. The
default value for denominator
The options are as follows:
- If the -e option is specified,
random does not read or write anything, and
simply exits with a random exit value of 0 to
denominator - 1, inclusive.
- The -r option guarantees that
the output is unbuffered.