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一个在linux下的shell的计算器

SC: the Shell Calculator
Copyright (C) Sergio Davis, <[e-mail]>, under GPL License version 2 
(See COPYING for details)

SC can be executed

i) Interactively, typing commands in the prompt: <sc> 
   The numbers in the stack appear in the rows numbered from 15 to 1
   You can get a list of available commands typing the "help" (or "?") command 
   (without quotes).

ii) From the command line:

$ sc "2 2 +"
4

In both cases the result of the last operation (the value in position 01 of the stack)
is printed to standard output on exit.