/usr/share/calc/help/pound 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.
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#
SYNOPSIS
#!/usr/local/src/cmd/calc/calc -q -f
# x
x # y
## comment
TYPES
x, y integer or real
return integer (uniary operator case)
integer or real (binary operator case)
DESCRIPTION
The pound sign or sharp sign "#" has special meaning in calc.
As a uniary operator:
# value
returns the number of 1 bits, or pop-count of the absolute value of
the numerator (abs(num(value))). Therefore when x is a non-negative
integer , # x is the pop-count of x. And thus when x is a negative
integer, # x returns the pop-count of abs(x). And in the general
case when x is a real, # x returns the pop-count of abs(num(x)).
As a binary operator:
x # y
returns abs(x-y), the absolute value of the difference.
When two or more pound signs in a row start a comment:
## this is a comment
### this is also a comment
print "this will print"; ## but this will not because it is a comment
A pound sign followed by a bang also starts a comment:
#! strictly speaking, this is a comment
print "this is correct but not recommended" #! acts like ##
On POSIX / Un*X / Linux / BSD conforming systems, when an executable
starts with the two bytes # and !, the remainder of the 1st line
(up to an operating system imposed limit) is taken to be the path
to the shell (plus shell arguments) that is to be executed. The
kernel appends the filename of the executable as a final argument
to the shell.
For example, of an executable file contains:
#!/usr/local/src/cmd/calc/calc -q -f
/* NOTE: The #! above must start in column 1 of the 1st line */
/* The 1st line must end with -f */
## Single # shell comments don't work, use two or more
print "2+2 =", 2+2;
When the above file it is executed by the kernel, it will print:
2+2 = 4
Such files are known to calc as cscripts. See "help cscript"
for examples.
It is suggested that the -q be added to the first line to
disable the reading of the startup scripts. It is not mandatory.
The last argument of the first line must be -f without the filename
because the kernel will supply the cscript filename as a final
argument. The final -f also implies -s. See "help usage" for
more information.
EXAMPLE
; #3
2
; #3.5
3
; 4 # 5
1
; 5 # 4
1
; pi() # exp(1)
0.4233108251307480031
; exp(1) # pi()
0.4233108251307480031
; ## this is a comment
LIMITS
none
LINK LIBRARY
none
SEE ALSO
cscript, unexpected, usage
## Copyright (C) 2007 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: pound,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/pound,v $
##
## Under source code control: 2007/02/06 14:09
## File existed as early as: 2007
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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