dcmdjpls: 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/dcmdjpls - from package: dcmtk

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

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