sv: command not found

Have You tried accessing the binary with the full path?

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/sv - from package: runit

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