[ -z "$1" ] && {
    echo 'Missing path parameter!' >&2
    return 1
}

full_path="$(readlink -e "$1")"
[ -d "$full_path" ] || {
    echo "Path doesn't exist!" >&2
    return 1
}

[[ ":$PATH:" == *":${full_path}:"* ]] || export PATH="$full_path:$PATH"

# vim: ft=sh