dcmpssnd: 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/dcmpssnd - from package: dcmtk

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

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