aws: 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/aws - from package: awscli

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

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