qrfcview: 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/qrfcview - from package: qrfcview

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

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