UNIX: Converting numbers with printf

Print a decimal number

$ printf "%d\n" 5
5

Print as float (default 6 decimal places)

$ printf "%f\n" 5
5.000000

Convert a hex number to decimal

$ printf "%d\n " 0xF
15

Convert a decimal number to Hex

$ printf "0x%X\n " 15
0xF

Convert a decimal number to Octal

$ printf "0%o\n " 8
010