riocp: 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/riocp - from package: karma-tools

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

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