gpdasm: 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/gpdasm - from package: gputils

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

On Debian possible default full paths are:

/usr/bin/gpdasm - from package: gputils

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

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