/usr/share/calc/help/substr 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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substr - extract a substring of given string
SYNOPSIS
substr(str, pos, len)
TYPES
str string
pos nonnegative integer
len nonnegative integer
return string
DESCRIPTION
If pos > length of str or len is zero, the null string "" is returned.
If 1 <= pos <= strlen(str), substr(str, pos, len) returns the
string of length min(strlen(str) - pos + 1, len) formed by
consecutive characters of str starting at position pos, i.e. the
string has length len if this is possible, otherwise it ends with
the last character of str. (The first character has pos = 1, the
second pos = 2, etc.)
If pos = 0, the result is the same as for pos = 1.
EXAMPLE
; A = "abcde";
; print substr(A,0,2), substr(A,1,2), substr(A,4,1), substr(A,3,5)
ab ab d cde
LIMITS
none
LINK LIBRARY
none
SEE ALSO
strcat, strcpy, strerror, strlen, strncmp, strncpy, strpos,
strprintf, strscan, strscanf
## Copyright (C) 1999-2006 Ernest Bowen
##
## 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: substr,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/substr,v $
##
## Under source code control: 1995/10/05 04:52:27
## 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/
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