bzz: 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 CentOS possible default full paths are:

/usr/bin/bzz - from package: djvulibre

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/bzz - from package: djvulibre-bin

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

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