stops: 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/lib/staden/bin/stops - from package: staden

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

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