hp-print: 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 CentOS possible default full paths are:

/usr/bin/hp-print - from package: hplip-gui

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/hp-print - from package: hplip-gui

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

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