slrnface: 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/slrnface - from package: slrnface

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

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