mshortname: 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/mshortname - from package: mtools

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

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