dfbinfo: 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/dfbinfo - from package: directfb

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

On Debian possible default full paths are:

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

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

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