xlbiff: 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/xlbiff - from package: xlbiff

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

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