eval
====

::

   NAME
     eval - evaluate

   SYNOPSIS
     eval [-b][-l] (expression) | value

   DESCRIPTION
     This command evaluates an expression or numeric value, and displays its
     result in hexadecimal, decimal, octal and binary. If the resultant value
     is an integral number of gigabytes, megabytes, or kilobytes, a short-hand
     translation of the number will also be shown next to the hexadecimal
     value.  If the most significant bit is set, the decimal display will show
     both unsigned and signed (negative) values.  Expressions must of the format
     (x operator y), where "x" and "y" may be either numeric values or
     symbols.  The list of operators are:

                        +  -  &  |  ^  *  %  /  <<  >>

     Enclosing the expression within parentheses is optional except when the
     "|", "<<" or ">>" operators are used.  The single "value" argument may
     be a number or symbol.  Number arguments must be hexadecimal or decimal.
     A leading "0x" identifies a number as hexadecimal, but is not required
     when obvious.  Numbers may be followed by the letters "k" or "K", "m"
     or "M", and "g" or "G", which multiplies the value by a factor of 1024,
     1 megabyte or 1 gigabyte, respectively.  Numeric arguments may be preceded
     by the one's complement operator ~.

       -b  Indicate which bit positions in the resultant value are set.
       -l  Numeric arguments are presumed to be 64-bit values, and the result
           will be expressed as a 64-bit value. (ignored on 64-bit processors)
           However, if either operand or the resultant value are 64-bit values,
           then the result will be also be expressed as a 64-bit value.

    The -b and -l options must precede the expression or value arguments.

   EXAMPLES
      crash> eval 128m
      hexadecimal: 8000000  (128MB)
          decimal: 134217728  
            octal: 1000000000
           binary: 00001000000000000000000000000000

      crash> eval 128 * 1m
      hexadecimal: 8000000  (128MB)
          decimal: 134217728  
            octal: 1000000000
           binary: 00001000000000000000000000000000

      crash> eval (1 << 27)
      hexadecimal: 8000000  (128MB)
          decimal: 134217728  
            octal: 1000000000
           binary: 00001000000000000000000000000000

      crash> eval (1 << 32)
      hexadecimal: 100000000  (4GB)
          decimal: 4294967296
            octal: 40000000000
           binary: 0000000000000000000000000000000100000000000000000000000000000000

      crash> eval -b 41dc065
      hexadecimal: 41dc065
          decimal: 69058661  
            octal: 407340145
           binary: 00000100000111011100000001100101
         bits set: 26 20 19 18 16 15 14 6 5 2 0 

      crash> eval -lb 64g
      hexadecimal: 1000000000  (64GB)
          decimal: 68719476736
            octal: 1000000000000
           binary: 0000000000000000000000000001000000000000000000000000000000000000
         bits set: 36