dfbinput: 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/dfbinput - from package: directfb

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

On Debian possible default full paths are:

/usr/bin/dfbinput - from package: libdirectfb-bin

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

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