xeno-regression-test: 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/bin/xeno-regression-test - from package: xenomai-runtime

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

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