ripperx: 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 Debian possible default full paths are:

/usr/bin/ripperx - from package: ripperx

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

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