Convert hexadecimal color to decimal RGB values in UNIX shell script

Question

I'm sure someone has already solved this problem: what is an easy and portable way to convert a hex color value (anything from 000000 to FFFFFF) to 3 decimal values from 0 to 255. (If you're not familiar with how colors are traditionally represented in HTML, the first two hex digits are the first decimal number, and so forth.)

Answer 1

$ cat hexrgb.sh
#!/bin/bash
hex="11001A"
printf "%d %d %d\n" 0x${hex:0:2} 0x${hex:2:2} 0x${hex:4:2}

$ ./hexrgb.sh
17 0 26

If you are not willing to use bash for substring expansion, I'd still use printf for the conversion.