qrq: 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/qrq - from package: qrq

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

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