rakverb: 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/rakverb - from package: rakarrack

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

On Debian possible default full paths are:

/usr/bin/rakverb - from package: rakarrack

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

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