runsv: 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/runsv - from package: runit

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

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