xenstore-rm: 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/sbin/xenstore-rm - from package: xenstore-utils

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

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