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LEARN ABOUT DEBIAN

bup-random

bup-random(1)						      General Commands Manual						     bup-random(1)

NAME

       bup-random - generate a stream of random output

SYNOPSIS

       bup random [-S seed] [-fv]

DESCRIPTION

       bup random produces a stream of pseudorandom output bytes to stdout.  Note: the bytes are not generated using a cryptographic algorithm and
       should never be used for security.

       Note that the stream of random bytes will be identical every time bup random is run, unless you provide a different seed  value.   This	is
       intentional:  the  purpose  of this program is to be able to run repeatable tests on large amounts of data, so we want identical data every
       time.

       bup random generates about 240 megabytes per second on a modern test system (Intel Core2), which is faster than you could achieve by  read-
       ing data from most disks.  Thus, it can be helpful when running microbenchmarks.

OPTIONS

       the number of bytes of data to generate.
	      Can be used with the suffices k, M, or G to indicate kilobytes, megabytes, or gigabytes, respectively.

       -S, --seed=seed
	      use  the	given  value  to  seed	the pseudorandom number generator.  The generated output stream will be identical for every stream
	      seeded with the same value.  The default seed is 1.  A seed value of 0 is equivalent to 1.

       -f, --force
	      generate output even if stdout is a tty.	(Generating random data to a tty is generally considered ill-advised, but you  can  do	if
	      you really want.)

       -v, --verbose
	      print a progress message showing the number of bytes that has been output so far.

EXAMPLES

	      $ bup random 1k | sha1sum
	      2108c55d0a2687c8dacf9192677c58437a55db71	-

	      $ bup random -S1 1k | sha1sum
	      2108c55d0a2687c8dacf9192677c58437a55db71	-

	      $ bup random -S2 1k | sha1sum
	      f71acb90e135d98dad7efc136e8d2cc30573e71a	-

	      $ time bup random 1G >/dev/null
	      Random: 1024 Mbytes, done.

	      real   0m4.261s
	      user   0m4.048s
	      sys    0m0.172s

	      $ bup random 1G | bup split -t --bench
	      Random: 1024 Mbytes, done.
	      bup: 1048576.00kbytes in 18.59 secs = 56417.78 kbytes/sec
	      1092599b9c7b2909652ef1e6edac0796bfbfc573

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-random(1)

Shell Programming and Scripting