xzoom: 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/xzoom - from package: xzoom

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

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