wmbiff: 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/wmbiff - from package: wmbiff

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

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