xencov_split: command not found

Have You tried accessing the binary with the full path?

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/xencov_split - from package: xen-utils-4.4

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