nqp-p: 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/nqp-p - from package: nqp

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

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