$ seq 10 | ./semirandom -n 4 --newline-in --newline-out
cmd output started 2016 Sat Apr 23 06:20:33 PM EDT
1
2
3
6
5
4
9
8
10
7

$ ./semirandom --help
Usage: ./semirandom -n 10 --newline-in --newline-out --no-newline-warning --help
-n 10                says to use a randomizing window of 10.  It is possible for values to move further than this
                     but it's vanishingly unlikely
--newline-in         Read lines separated by newlines instead of nulls
--newline-out        Write lines separated by newlines instead of nulls
--no-newline-warning Do not warn about a single null-terminated line containing newlines

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