zoomer: 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/zoomer - from package: zoomer

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

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