silan: 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/silan - from package: silan

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

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