msh: 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/mh/msh - from package: nmh

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

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