swift-config: 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/swift-config - from package: python-swift

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

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