logarithm

Hi Guys,
Is it possible to do Logarithm of a number in Unix?? i dunno how to handl logarithm operation

assuming gnu bc:

echo "l(100)" | bc -l

l (ell) is natural logarithm.

is there any way to do log(100) which is equal to 2
not the natural logarithm. log of base 10

nevermind i got it

thanks alot for your help