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Full Discussion: Randomly selecting sequences and generating specific output files
Top Forums Shell Programming and Scripting Randomly selecting sequences and generating specific output files Post 302786081 by Don Cragun on Tuesday 26th of March 2013 07:33:19 PM
Old 03-26-2013
In you output samples, the lines in each set of output files are all in the order in which they appeared in the input files. Is that a requirement for your output, or is it just a coincidence in the random numbers used for your example?

With truly random numbers, the output could contain more than one copy of some output lines. Is it a requirement that the output lines be unique?
Last edited by Don Cragun; 03-26-2013 at 08:35 PM.. Reason: added another question
 

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LEARN ABOUT X11R4

shuf

SHUF(1) 							   User Commands							   SHUF(1)

NAME

       shuf - generate random permutations

SYNOPSIS

       shuf [OPTION]... [FILE]
       shuf -e [OPTION]... [ARG]...
       shuf -i LO-HI [OPTION]...

DESCRIPTION

       Write a random permutation of the input lines to standard output.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -e, --echo
	      treat each ARG as an input line

       -i, --input-range=LO-HI
	      treat each number LO through HI as an input line

       -n, --head-count=COUNT
	      output at most COUNT lines

       -o, --output=FILE
	      write result to FILE instead of standard output

       --random-source=FILE
	      get random bytes from FILE

       -r, --repeat
	      output lines can be repeated

       -z, --zero-terminated
	      line delimiter is NUL, not newline

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Paul Eggert.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report shuf translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/shuf>
       or available locally via: info '(coreutils) shuf invocation'

GNU coreutils 8.28						   January 2018 							   SHUF(1)
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