Tiny Pure BASH Calulator

caluclator.bash

# CLI Calculator.
#
# Install: Add to .bashrc.
#
# Usage: '$ = 10*33'
# See: https://askubuntu.com/questions/378661
#
# Installation: Put code to .bashrc or .bash_aliases.
#
# Functions:
# sqrt ( expression ) The value of the sqrt function is the square root of the expression.
# s (x)  The sine of x, x is in radians.
# c (x)  The cosine of x, x is in radians.
# a (x)  The arctangent of x, arctangent returns radians.
# l (x)  The natural logarithm of x.
# e (x)  The exponential function of raising e to the value x.
# j (n,x) The Bessel function of integer order n of x.
# Function's usage example: = "sqrt(33)"
=() {
  # Simple caluclator: echo "$(($@))"
  # Using 'bc'
  local IFS=' '
  local calc="${*//p/+}"
  calc="${calc//x/*}"
  local result=$(bc -l <<<"scale=10;$calc")
  env LC_ALL=en_US.UTF-8 printf "%'.3f\n" $result
}