txaws-list-buckets: 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/txaws-list-buckets - from package: python-txaws

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

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