riparrange: 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/riparrange - from package: ripright

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

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