qrqscore: 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/qrqscore - from package: qrq

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

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