fiz: 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/fiz - from package: zoo

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

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