zzuf: command not found

Have You tried accessing the binary with the full path?

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/zzuf - from package: zzuf

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