/usr/share/calc/help/randperm is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | NAME
    randperm - randomly permute a list or matrix
SYNOPSIS
    randperm(x)
TYPES
    x		list or matrix
    return	same as x
DESCRIPTION
    For a list or matrix x, randperm(x) returns a copy of x in which
    the elements have been randomly permuted.  The value of x is not
    changed.
    This function uses the rand() subtractive 100 shuffle pseudo-random
    number generator.
EXAMPLE
    ; A = list(1,2,2,3,4)
    ; randperm(A)
    list (5 elements, 5 nonzero):
	  [[0]] = 4
	  [[1]] = 1
	  [[2]] = 2
	  [[3]] = 3
	  [[4]] = 2
    ; randperm(A)
    list (5 elements, 5 nonzero):
	  [[0]] = 2
	  [[1]] = 1
	  [[2]] = 4
	  [[3]] = 2
	  [[4]] = 3
LIMITS
    none
LINK LIBRARY
    none
SEE ALSO
    comp, fact, rand, perm
## Copyright (C) 1999-2006  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: randperm,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/randperm,v $
##
## Under source code control:	1995/07/10 02:09:31
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
 |