/usr/share/calc/help/isblk is in apcalc-common 2.12.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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isblk - whether or not a value is a block
SYNOPSIS
isblk(val)
TYPES
val any
return 0, 1, or 2
DESCRIPTION
isblk(val) returns 1 if val is an unnamed block, 2 if val is a
named block, 0 otherwise.
Note that a named block B retains its name after its data block is
freed by rmblk(B). That a named block B has null data block may be
tested using sizeof(B); this returns 0 if and only if the memory
has been freed.
EXAMPLE
; A = blk()
; isblk(A)
1
; B = blk("beta")
; isblk(B)
2
; isblk(3)
0
LIMITS
none
LINK LIBRARY
none
SEE ALSO
blk, blocks, blkfree,
isassoc, isatty, isconfig, isdefined, iserror, iseven, isfile,
ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
issimple, issq, isstr, istype
## 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: isblk,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/isblk,v $
##
## Under source code control: 1997/04/06 03:03:23
## File existed as early as: 1997
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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