downtimes: 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/downtimes - from package: downtimed

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

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