silock: 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/silock - from package: libsilo-bin

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

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