mtoolstest: 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 CentOS possible default full paths are:

/usr/bin/mtoolstest - from package: mtools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mtoolstest - from package: mtools

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

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