dcmdjpeg: 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/dcmdjpeg - from package: dcmtk

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

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