fizzbuzz.sh6

#!/usr/bin/env osh

: "Language:       Thompson Shell (Unix V6)"
: "Web site:       https://etsh.nl/"
: "Last tested on: Ubuntu 24.04.2 LTS"
: "Requires:       Install from source, https://etsh.nl/src/osh-4.2.1.tar.gz"
: "                NOTE: Using the sh6 command, this works under Linux"
: "                Mint 17.3, but fails under Ubuntu 17.10, apparently due"
: "                to a problem with the external goto command Attempts"
: "                to diagnose and correct the problem, with the help of"
: "                J.A. Neitzel, the maintainer of the v6shell project,"
: "                were unsuccessful.  As a workaround, I'm now using osh"
: "                (which implements goto internally) rather than sh6."

echo 0 > _count

: LOOP
    ( cat _count ; echo 1 + p ) | dc > _count.new ; mv _count.new _count

    ( cat _count ; echo 15 % p ) | dc > _imod15
    if { grep -v '^0$' _imod15 > /dev/null } goto L1
    echo FizzBuzz
    goto NEXT
    : L1

    ( cat _count ; echo 3 % p ) | dc > _imod3
    if { grep -v '^0$' _imod3 > /dev/null } goto L2
    echo Fizz
    goto NEXT
    : L2

    ( cat _count ; echo 5 % p ) | dc > _imod5
    if { grep -v '^0$' _imod5 > /dev/null } goto L3
    echo Buzz
    goto NEXT
    : L3

    cat _count

    : NEXT
    if { grep '^100$' _count > /dev/null } goto DONE
goto LOOP

: DONE
rm _count _imod3 _imod5 _imod15