zombiescope: 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/zombiescope - from package: spark

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

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