runsvdir: 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/runsvdir - from package: runit

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

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