xfd: 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 CentOS possible default full paths are:

/usr/bin/xfd - from package: xorg-x11-apps

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/xfd - from package: x11-utils

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

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