dcmdump: 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 Debian possible default full paths are:

/usr/bin/dcmdump - from package: dcmtk

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

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