dumphdr: 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/dumphdr - from package: xbase-utils

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

On Debian possible default full paths are:

/usr/bin/dumphdr - from package: libxbase64-bin

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

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