pgpdump: 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/pgpdump - from package: pgpdump

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

On Debian possible default full paths are:

/usr/bin/pgpdump - from package: pgpdump

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

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