artisan command that looks in parent directories for where artisan is located.

artisan.sh

#!/bin/bash

wanted=$(basename $0)

dir=.
while [[ ! -x "$dir/$wanted" ]]; do
    if [[ "$dir" -ef "../$dir" ]]; then
        echo "$wanted not in the current directory or any of its parents" 1>&2
        exit 2
    fi

    dir="../$dir"
done

dir=$(cd -- "$dir" && pwd)

if [[ "$dir/$wanted" -ef "$0" ]]; then
    echo "Cannot call self."
    exit 2
fi

exec "$dir/$wanted" "$@"