zdump: 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/sbin/zdump - from package: glibc-common

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

On Debian possible default full paths are:

/usr/bin/zdump - from package: libc-bin

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

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