xenpm: 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/lib/xen-4.4/bin/xenpm - from package: xen-utils-4.4
/usr/sbin/xenpm - from package: xen-utils-common

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

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