Sure, you can use commandline python or ruby (
irb); but you may use
bc, the inbuilt arbitrary precision calculator, as well. A typical syntax would be:
$ echo "scale=4; 7/9" | bc
bc to print the result of 7 divided by 9 with 4 digits after the decimal point.
You may save the following script in a file say cal.bsh in the home directory
echo "scale=4; $1" | bc ;exit
Then make it executable and use it to do the calculation
$ ~/cal.bsh 7/9
For more information:
While you are at it, you may want to have a look at some built-in math functions there, e.g.
s(x) = sin(x)
c(x) = cos(x)
a(x) = arctan(x)
l(x) = Ln(x)
e(x) = exp(x)
These functions are preloaded using the
-l flag. Moreover, when this flag is used the default scale is set to 20.