compte avec des chiffres romain jusqu’à 3999

int2rom.sh

#!/usr/bin/env bash

[[ $1 -gt 3999 ]] && echo $1 too big! && exit 1

result=""
for i in $(seq $1); do
  result+="I"

  result=${result/%IIII/IV}
  result=${result/%IVI/V}
  result=${result/%VIV/IX}
  result=${result/%IXI/X}

  result=${result/%XXXX/XL}
  result=${result/%XLX/L}
  result=${result/%LXL/XC}
  result=${result/%XCX/C}

  result=${result/%CCCC/CD}
  result=${result/%CDC/D}
  result=${result/%DCD/CM}
  result=${result/%CMC/M}

  printf "%4d → %s\n" $i $result
done