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간단한 계산 (리눅스/유닉스) 명령어 : bc -l

bc -l
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
67*3
201

quit


DESCRIPTION
       bc  is  a  language  that supports arbitrary precision numbers with interactive execution of statements.  There are some similarities in the syntax to the C programming
       language.  A standard math library is available by command line option.  If requested, the math library is defined before processing any files.  bc starts by processing
       code from all the files listed on the command line in the order listed.  After all files have been processed, bc reads from the standard input.  All code is executed as
       it is read.  (If a file contains a command to halt the processor, bc will never read from the standard input.)

       This version of bc contains several extensions beyond traditional bc implementations and the POSIX draft standard.  Command line options can cause these  extensions  to
       print a warning or to be rejected.  This document describes the language accepted by this processor.  Extensions will be identified as such.

   OPTIONS
       -h, --help
              Print the usage and exit.

       -i, --interactive
              Force interactive mode.

       -l, --mathlib
              Define the standard math library.

       -w, --warn
              Give warnings for extensions to POSIX bc.

       -s, --standard
              Process exactly the POSIX bc language.

       -q, --quiet
              Do not print the normal GNU bc welcome.

       -v, --version
              Print the version number and copyright and quit.