mattrib: 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/mattrib - from package: mtools

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

On Debian possible default full paths are:

/usr/bin/mattrib - from package: mtools

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

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