1. Convert hexadecimal to decimal printf%d0xF15 or echo$((16#F))15
2. Similarly, binary conversion to decimal echo$((2#111))7
3. Convert octal to decimal echo$((8#11))9
4. Convert decimal to octal printf%o911
5. Convert decimal to hexadecimal printf%x15f or echo "obase=16;15"|bcF
6. Convert decimal to binary echo "obase=2;15"|bc1111