hpixml: 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/hpixml - from package: openhpi32

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

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