rlprm: 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/rlprm - from package: rlpr

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

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