/* * ***************************************************************************** * * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2018-2023 Gavin D. Howard and contributors. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * ***************************************************************************** * * The bc help text. * */ usage: %s [options] [file...] bc is a command-line, arbitrary-precision calculator with a Turing-complete language. For details, use `man %s` or see the online documentation at https://git.gavinhoward.com/gavin/bc/src/tag/%s/manuals/bc/%s.1.md. This bc is compatible with both the GNU bc and the POSIX bc spec. See the GNU bc manual (https://www.gnu.org/software/bc/manual/bc.html) and bc spec (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html) for details. This bc has three differences to the GNU bc: 1) Arrays can be passed to the builtin "length" function to get the number of elements currently in the array. The following example prints "1": a[0] = 0 length(a[]) 2) The precedence of the boolean "not" operator (!) is equal to that of the unary minus (-), or negation, operator. This still allows POSIX-compliant scripts to work while somewhat preserving expected behavior (versus C) and making parsing easier. 3) This bc has many more extensions than the GNU bc does. For details, see the man page or online documentation. This bc also implements the dot (.) extension of the BSD bc. Options: -C --no-digit-clamp Disables clamping of digits that are larger than or equal to the current ibase when parsing numbers. This means that the value added to a number from a digit is always that digit's value multiplied by the value of ibase raised to the power of the digit's position, which starts from 0 at the least significant digit. If multiple of this option and the -c option are given, the last is used. -c --digit-clamp Enables clamping of digits that are larger than or equal to the current ibase when parsing numbers. This means that digits that the value added to a number from a digit that is greater than or equal to the ibase is the value of ibase minus 1 all multiplied by the value of ibase raised to the power of the digit's position, which starts from 0 at the least significant digit. If multiple of this option and the -C option are given, the last is used. {{ A H N HN }} -E seed --seed=seed Sets the builtin variable seed to the given value assuming that the given value is in base 10. It is a fatal error if the given value is not a valid number. {{ end }} -e expr --expression=expr Run "expr" and quit. If multiple expressions or files (see below) are given, they are all run before executing from stdin. -f file --file=file Run the bc code in "file" and exit. See above as well. -g --global-stacks Turn scale, ibase, and obase into stacks. This makes the value of each be be restored on returning from functions. See the man page or online documentation for more details. -h --help Print this usage message and exit. -I ibase --ibase=ibase Sets the builtin variable ibase to the given value assuming that the given value is in base 10. It is a fatal error if the given value is not a valid number. -i --interactive Force interactive mode. -L --no-line-length Disable line length checking. -l --mathlib Use predefined math routines: s(expr) = sine of expr in radians c(expr) = cosine of expr in radians a(expr) = arctangent of expr, returning radians l(expr) = natural log of expr e(expr) = raises e to the power of expr j(n, x) = Bessel function of integer order n of x This bc may load more functions with these options. See the manpage or online documentation for details. -O obase --obase=obase Sets the builtin variable obase to the given value assuming that the given value is in base 10. It is a fatal error if the given value is not a valid number. -P --no-prompt Disable the prompts in interactive mode. -R --no-read-prompt Disable the read prompt in interactive mode. -r keyword --redefine=keyword Redefines "keyword" and allows it to be used as a function, variable, and array name. This is useful when this bc gives parse errors on scripts meant for other bc implementations. Only keywords that are not in the POSIX bc spec may be redefined. It is a fatal error to attempt to redefine a keyword that cannot be redefined or does not exist. -q --quiet Don't print version and copyright. -S scale --scale=scale Sets the builtin variable scale to the given value assuming that the given value is in base 10. It is a fatal error if the given value is not a valid number. -s --standard Error if any non-POSIX extensions are used. -w --warn Warn if any non-POSIX extensions are used. -v --version Print version information and copyright and exit. -z --leading-zeroes Enable leading zeroes on numbers greater than -1 and less than 1. Environment variables: POSIXLY_CORRECT Error if any non-POSIX extensions are used. BC_ENV_ARGS Command-line arguments to use on every run. BC_LINE_LENGTH If an integer, the number of characters to print on a line before wrapping. Using 0 will disable line length checking. BC_BANNER If an integer and non-zero, display the copyright banner in interactive mode. If zero, disable the banner. Overrides the default, which is %s print the banner. BC_SIGINT_RESET If an integer and non-zero, reset on SIGINT, rather than exit, when in interactive mode. If zero, do not reset on SIGINT in all cases, but exit instead. Overrides the default, which is %s. BC_TTY_MODE If an integer and non-zero, enable TTY mode when it is available. If zero, disable TTY mode in all cases. Overrides the default, which is TTY mode %s. BC_PROMPT If an integer and non-zero, enable prompt when TTY mode is possible. If zero, disable prompt in all cases. Overrides the default, which is prompt %s. BC_EXPR_EXIT If an integer and non-zero, exit when expressions or expression files are given on the command-line, and does not exit when an integer and zero. Overrides the default, which is %s. BC_DIGIT_CLAMP If an integer and non-zero, clamp digits larger than or equal to the current ibase when parsing numbers. Overrides the default, which is %s.