z88o: 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/z88o - from package: z88

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

Error in other languages:
z88o: bevel nie gevind nie
z88o: comandă negăsită
z88o: comando não encontrado
z88o: commande introuvable
z88o: command not found
z88o: käsku ei ole
z88o: không tìm thấy lệnh
z88o: komanda nerasta
z88o: Kommando nicht gefunden.
z88o: kommandot finns inte
z88o: komut yok
z88o: nie znaleziono polecenia
z88o: níor aimsíodh an t-ordú
z88o: no se encontró la orden
z88o: no s'ha trobat l'ordre
z88o: opdracht niet gevonden
z88o: parancs nem található
z88o: perintah tidak ditemukan
z88o: príkaz nenájdený
z88o: příkaz nenalezen
z88o: команда не найдена
z88o: командата не е открита
z88o: 命令找不到
z88o: コマンドが見つかりません