get.php: 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/share/simplesamlphp/modules/aggregator/bin/get.php - from package: simplesamlphp

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

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