rakconvert: 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/rakconvert - from package: rakarrack

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

On Debian possible default full paths are:

/usr/bin/rakconvert - from package: rakarrack

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

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