uwmdump: 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/uwmdump - from package: directfb

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

On Debian possible default full paths are:

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

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

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