qpxtool: 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/qpxtool - from package: qpxtool

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

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