For integer conversions, specifying a precision implies
                   that the output of the number itself should be zero-padded
                   to this width, where the 0 flag is ignored:

                     printf '<%.6d>', 1;      # prints "<000001>"
                     printf '<%+.6d>', 1;     # prints "<+000001>"
                     printf '<%-10.6d>', 1;   # prints "<000001    >"
                     printf '<%10.6d>', 1;    # prints "<    000001>"
                     printf '<%010.6d>', 1;   # prints "<    000001>"
                     printf '<%+10.6d>', 1;   # prints "<   +000001>"

                     printf '<%.6x>', 1;      # prints "<000001>"
                     printf '<%#.6x>', 1;     # prints "<0x000001>"
                     printf '<%-10.6x>', 1;   # prints "<000001    >"
                     printf '<%10.6x>', 1;    # prints "<    000001>"
                     printf '<%010.6x>', 1;   # prints "<    000001>"
                     printf '<%#10.6x>', 1;   # prints "<  0x000001>"