z88d: 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/z88d - from package: z88

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

Error in other languages:
z88d: bevel nie gevind nie
z88d: comandă negăsită
z88d: comando não encontrado
z88d: commande introuvable
z88d: command not found
z88d: käsku ei ole
z88d: không tìm thấy lệnh
z88d: komanda nerasta
z88d: Kommando nicht gefunden.
z88d: kommandot finns inte
z88d: komut yok
z88d: nie znaleziono polecenia
z88d: níor aimsíodh an t-ordú
z88d: no se encontró la orden
z88d: no s'ha trobat l'ordre
z88d: opdracht niet gevonden
z88d: parancs nem található
z88d: perintah tidak ditemukan
z88d: príkaz nenájdený
z88d: příkaz nenalezen
z88d: команда не найдена
z88d: командата не е открита
z88d: 命令找不到
z88d: コマンドが見つかりません