qbs: 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/qbs - from package: qtcreator

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

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