dcm2xml: 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/dcm2xml - from package: dcmtk

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

Error in other languages:
dcm2xml: bevel nie gevind nie
dcm2xml: comandă negăsită
dcm2xml: comando não encontrado
dcm2xml: commande introuvable
dcm2xml: command not found
dcm2xml: käsku ei ole
dcm2xml: không tìm thấy lệnh
dcm2xml: komanda nerasta
dcm2xml: Kommando nicht gefunden.
dcm2xml: kommandot finns inte
dcm2xml: komut yok
dcm2xml: nie znaleziono polecenia
dcm2xml: níor aimsíodh an t-ordú
dcm2xml: no se encontró la orden
dcm2xml: no s'ha trobat l'ordre
dcm2xml: opdracht niet gevonden
dcm2xml: parancs nem található
dcm2xml: perintah tidak ditemukan
dcm2xml: príkaz nenájdený
dcm2xml: příkaz nenalezen
dcm2xml: команда не найдена
dcm2xml: командата не е открита
dcm2xml: 命令找不到
dcm2xml: コマンドが見つかりません