xpamb: 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/xpamb - from package: xpa

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

On Debian possible default full paths are:

/usr/bin/xpamb - from package: xpa-tools

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

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