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notes:bc_cheat_sheet [2026/05/31 01:52]
114.119.158.251 old revision restored (2007/10/18 11:24) 		notes:bc_cheat_sheet [2026/06/07 04:46] (current)
43.153.220.175 old revision restored (2026/06/03 02:16)
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-==== GNU bc Cheat Sheet ====+===== GNU bc Cheat Sheet =====
  
-=== Overview ===+==== Overview ====
  
   *  [[http://en.wikipedia.org/wiki/Bc_programming_language | bc ]] is a command-line calculator and primitive language   *  [[http://en.wikipedia.org/wiki/Bc_programming_language | bc ]] is a command-line calculator and primitive language
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   *  bc is a [[http://www.opengroup.org/onlinepubs/009695399/utilities/bc.html |POSIX standard]] but the [[http://www.gnu.org/software/bc/ | GNU version]] has added functionality   *  bc is a [[http://www.opengroup.org/onlinepubs/009695399/utilities/bc.html |POSIX standard]] but the [[http://www.gnu.org/software/bc/ | GNU version]] has added functionality
  
-  *  bc by default runs in integer mode (scale=0) and with no trig functions, running "bc -l" loads trig functions and sets scale to 20+  *  bc by default runs in integer mode (scale=0) and with no trig functions, running ''bc -l'' loads trig functions and sets scale to 20
  
-  *  bc can only take expressions on standard input (or in files), not directly on the command line e.g. echo 3+4 | bc+  *  bc can only take expressions on standard input or in files, not directly on the command line. One way to do a bc one-liner is ''echo 3+4 | bc'' .
  
   * [[http://www.phodd.net/cyrek/gnu-bc/ | This]] is a great collection of bc functions. funcs.bc and logic.bc  are the basic ones. [[ http://x-bc.sourceforge.net/extensions_bc.html | This]] is a collection of more sanely named basic scientific calculator functions.   * [[http://www.phodd.net/cyrek/gnu-bc/ | This]] is a great collection of bc functions. funcs.bc and logic.bc  are the basic ones. [[ http://x-bc.sourceforge.net/extensions_bc.html | This]] is a collection of more sanely named basic scientific calculator functions.
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 </code> </code>
    
-So now "mbc '(3+5)/6'" works as expected+So now '' mbc '(3+5)/6' '' works as expected
  
   * bc uses readline so ⇑ and ⇓ (for history) and ctrl-r (for searching) work as expected.   * bc uses readline so ⇑ and ⇓ (for history) and ctrl-r (for searching) work as expected.
  
-=== Basic Usage ===+==== Basic Usage ====
  
   * Any alphanumeric variable name is allowed once it starts with a letter.   * Any alphanumeric variable name is allowed once it starts with a letter.
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   * && , || , ! work as expected (return 0 or 1).   * && , || , ! work as expected (return 0 or 1).
  
-=== Advanced Usage ===+==== Advanced Usage ====
  
   * New functions are easy to define e.g. <code>   * New functions are easy to define e.g. <code>
notes/bc_cheat_sheet.1780217552.txt.gz · Last modified: 2026/05/31 01:52 by 114.119.158.251

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