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Many programming languages do not allow you to begin a variable name with a number as it would make it more difficult for a compiler or interpreter to parse a program's source code.
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shuf(1) [suse man page]

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. 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 (default /dev/urandom) -z, --zero-terminated end lines with 0 byte, not newline --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Paul Eggert. REPORTING BUGS
Report shuf bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 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
The full documentation for shuf is maintained as a Texinfo manual. If the info and shuf programs are properly installed at your site, the command info coreutils 'shuf invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 SHUF(1)

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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. 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-lines=LINES output at most LINES lines -o, --output=FILE write result to FILE instead of standard output --random-source=FILE get random bytes from FILE (default /dev/urandom) -z, --zero-terminated end lines with 0 byte, not newline --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Paul Eggert. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for shuf is maintained as a Texinfo manual. If the info and shuf programs are properly installed at your site, the command info shuf should give you access to the complete manual. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+--------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+--------------------+ |Availability | SUNWgnu-coreutils | +--------------------+--------------------+ |Interface Stability | Uncommitted | +--------------------+--------------------+ NOTES
Source for GNU coreutils is available on http://opensolaris.org. shuf 6.7 December 2006 SHUF(1)

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