metastudent: 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/metastudent - from package: metastudent

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

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