rlplot: 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/rlplot - from package: rlplot

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

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