shnpad: 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/shnpad - from package: shntool

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

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