patnotify: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/patnotify - from package: dist

You may install the required package with command apt-get install {package}

Error in other languages:
patnotify: bevel nie gevind nie
patnotify: comandă negăsită
patnotify: comando não encontrado
patnotify: commande introuvable
patnotify: command not found
patnotify: käsku ei ole
patnotify: không tìm thấy lệnh
patnotify: komanda nerasta
patnotify: Kommando nicht gefunden.
patnotify: kommandot finns inte
patnotify: komut yok
patnotify: nie znaleziono polecenia
patnotify: níor aimsíodh an t-ordú
patnotify: no se encontró la orden
patnotify: no s'ha trobat l'ordre
patnotify: opdracht niet gevonden
patnotify: parancs nem található
patnotify: perintah tidak ditemukan
patnotify: príkaz nenájdený
patnotify: příkaz nenalezen
patnotify: команда не найдена
patnotify: командата не е открита
patnotify: 命令找不到
patnotify: コマンドが見つかりません