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+* Math on the cli
+<code>
+Basic operations
+$ echo $((1+1))
+$ echo $((3-1))
+$ echo $((4/2))
+$ echo $((1*2))
+Basic ops using expr
+$ expr 60 / 5
+Floating point calculations
+$ echo "2*2.2/2.2" | bc
+$ echo "4.4+7/8-(4.74*3.14)" | bc
+-10.48
+using here-doc
+$ bc <<< "4.4+7/8-(4.74*3.14)"
+-10.48
+a bash funtion, for your .bashrc
+calc () {
+    bc -l <<< "$@"
+}
+usage:
+$ calc 65320*670
+43764400
+</code>