dcmprscu: command not found

Have You tried accessing the binary with the full path?

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/dcmprscu - from package: dcmtk

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