simple_pacs: 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/simple_pacs - from package: ctn

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

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