Through BC Computing Pi

echo "Scale=${num}; 4*a (1) "| Bc-lq
For example:

echo "scale=5000; 4*a (1) "| Bc-lq

The 4*a (1) is a calculated pi function provided by the BC host, and the scale is the meaning of the BC to calculate a few decimal digits. The greater the scale value, the more accurate the pi is to be calculated,

The more time you use it, the more time you'll spend! This can be used to test the performance of the CPU.

Transferred from: http://linux.vbird.org/linux_basic/0340bashshell-scripts.php

Through BC Computing Pi