mac-robber: 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/mac-robber - from package: mac-robber

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

On Debian possible default full paths are:

/usr/bin/mac-robber - from package: mac-robber

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

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