Changing base of a number
Suppose we want to convert 0xFACE into decimal value. echo "ibase=16; obase=A; FACE" | bc 'ibase' is input number base. 'obase' is output number base in ibase number.(10 is A in hexadecimal format). 'FACE' is the number. when we dont specify any of the value, its assumed to be 10.