Integrated command line math

Re:Integrated command line math by cespare on Tuesday July 23, 2013 @02:58PM (#6092174)

Probably known to most, but your shell can also do simple arithmetic by itself.

  $ echo $((3**5))
  243

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Re:Integrated command line math by kps on Tuesday July 23, 2013 @04:02PM (#6092552)

ksh and zsh support floating point, and ksh also has the usual math functions.

  $ echo $((2 * atan2(1, 0)))
  3.14159265358979324

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Re:Integrated command line math by dgl on Tuesday July 23, 2013 @05:17PM (#6092963)

In zsh you could use noglob to make this nicer:

  zmodload zsh/mathfunc
  _calc() { echo $[$*] }
  alias c='noglob _calc'

Then:

  % c 2 * atan(1, 0) 
  3.1415926535897931

(Although this works with any command, using an alias with qalc as pointed out above might be more useful.)

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