matho: 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/matho - from package: mathomatic

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

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