this no one will understand i promise

 #!/usr/bin/env bash

# pyreg.sh: registry-style store in pure bash.
#
# Here the directory tree IS the registry: keys are directories under
# ~/pyreg/ and values are files, so ls/cat/grep work on it directly.
#
# Usage:
#   pyreg.sh set     <key> <name> <value>
#   pyreg.sh setfile <key> <name> <file>
#   pyreg.sh get     <key> <name>
#   pyreg.sh run     <key> <name>     run a stored script (.py .pl .sh)
#   pyreg.sh list
set -euo pipefail

ROOT="${PYREG_ROOT:-$HOME/pyreg}"

die() { echo "$*" >&2; exit 1; }

# HKEY_CURRENT_USER\Software\App -> $ROOT/HKEY_CURRENT_USER/Software/App
key_dir() {
  local key="${1//\\//}" part out="$ROOT"
  local IFS=/
  for part in $key; do
    [[ -z "$part" ]] && continue
    [[ "$part" == "." || "$part" == ".." ]] && die "invalid key"
    out+="/$part"
  done
  printf '%s' "$out"
}

value_path() {
  [[ "$2" == */* || "$2" == "." || "$2" == ".." || -z "$2" ]] && die "invalid value name"
  printf '%s/%s' "$(key_dir "$1")" "$2"
}

cmd="${1:-}"
[[ -z "$cmd" ]] && { sed -n '2,13p' "$0" | sed 's/^# \{0,1\}//'; exit 0; }
shift

case "$cmd" in
  set)
    [[ $# -eq 3 ]] || die "usage: set <key> <name> <value>"
    p="$(value_path "$1" "$2")"
    mkdir -p "$(dirname "$p")"
    printf '%s' "$3" > "$p"
    [[ "$2" =~ \.(py|pl|sh)$ ]] && chmod 755 "$p"
    echo "stored $p"
    ;;
  setfile)
    [[ $# -eq 3 ]] || die "usage: setfile <key> <name> <file>"
    [[ -r "$3" ]] || die "cannot read $3"
    p="$(value_path "$1" "$2")"
    mkdir -p "$(dirname "$p")"
    cp "$3" "$p"
    [[ "$2" =~ \.(py|pl|sh)$ ]] && chmod 755 "$p"
    echo "stored $p"
    ;;
  get)
    [[ $# -eq 2 ]] || die "usage: get <key> <name>"
    p="$(value_path "$1" "$2")"
    [[ -f "$p" ]] && cat "$p" || true
    echo
    ;;
  run)
    [[ $# -eq 2 ]] || die "usage: run <key> <name>"
    p="$(value_path "$1" "$2")"
    [[ -f "$p" ]] || die "no such value"
    case "$2" in
      *.py) exec python3 "$p" ;;
      *.pl) exec perl "$p" ;;
      *.sh) exec bash "$p" ;;
      *)    die "don't know how to run '$2'" ;;
    esac
    ;;
  list)
    [[ -d "$ROOT" ]] || exit 0
    (cd "$ROOT" && find . -type f | sed 's|^\./||' | sort)
    ;;
  *)
    die "unknown command '$cmd'"
    ;;
esac