[bc](<https://www.gnu.org/software/bc/manual/html_mono/bc.html>) is an arbitrary precision calculator language. It could be used interactively or be executed from command line.

For example, it can print out the result of an expression:

echo '2 + 3' | bc
5

echo '12 / 5' | bc
2

For floating-post arithmetic, you can import standard library bc -l:

echo '12 / 5' | bc -l
2.40000000000000000000

It can be used for comparing expressions:

echo '8 > 5' | bc
1

echo '10 == 11' | bc
0

echo '10 == 10 && 8 > 3' | bc
1