xdfcopy: 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/xdfcopy - from package: fdutils

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

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