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126 lines
4.1 KiB
126 lines
4.1 KiB
4 months ago
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/*
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* *****************************************************************************
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018-2021 Gavin D. Howard and contributors.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* *****************************************************************************
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*
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* The bc help text.
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*
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*/
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usage: %s [options] [file...]
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bc is a command-line, arbitrary-precision calculator with a Turing-complete
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language. For details, use `man %s` or see the online documentation at
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https://git.yzena.com/gavin/bc/src/tag/%s/manuals/bc/%s.1.md.
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This bc is compatible with both the GNU bc and the POSIX bc spec. See the GNU bc
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manual (https://www.gnu.org/software/bc/manual/bc.html) and bc spec
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(http://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
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for details.
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This bc has three differences to the GNU bc:
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1) Arrays can be passed to the builtin "length" function to get the number of
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elements currently in the array. The following example prints "1":
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a[0] = 0
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length(a[])
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2) The precedence of the boolean "not" operator (!) is equal to that of the
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unary minus (-), or negation, operator. This still allows POSIX-compliant
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scripts to work while somewhat preserving expected behavior (versus C) and
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making parsing easier.
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3) This bc has many more extensions than the GNU bc does. For details, see the
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man page or online documentation.
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This bc also implements the dot (.) extension of the BSD bc.
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Options:
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-e expr --expression=expr
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Run "expr" and quit. If multiple expressions or files (see below) are
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given, they are all run before executing from stdin.
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-f file --file=file
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Run the bc code in "file" and exit. See above as well.
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-g --global-stacks
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Turn scale, ibase, and obase into stacks. This makes the value of each be
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be restored on returning from functions. See the man page or online
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documentation for more details.
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-h --help
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Print this usage message and exit.
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-i --interactive
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Force interactive mode.
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-l --mathlib
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Use predefined math routines:
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s(expr) = sine of expr in radians
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c(expr) = cosine of expr in radians
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a(expr) = arctangent of expr, returning radians
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l(expr) = natural log of expr
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e(expr) = raises e to the power of expr
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j(n, x) = Bessel function of integer order n of x
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This bc may load more functions with these options. See the manpage or
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online documentation for details.
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-P --no-prompt
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Disable the prompts in interactive mode.
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-R --no-read-prompt
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Disable the read prompt in interactive mode.
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-q --quiet
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Don't print version and copyright.
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-s --standard
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Error if any non-POSIX extensions are used.
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-w --warn
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Warn if any non-POSIX extensions are used.
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-v --version
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Print version information and copyright and exit.
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