dcdirdmp: 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/dcdirdmp - from package: dicom3tools

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

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