s3mkbucket: 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/s3mkbucket - from package: libnet-amazon-s3-tools-perl

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

Error in other languages:
s3mkbucket: bevel nie gevind nie
s3mkbucket: comandă negăsită
s3mkbucket: comando não encontrado
s3mkbucket: commande introuvable
s3mkbucket: command not found
s3mkbucket: käsku ei ole
s3mkbucket: không tìm thấy lệnh
s3mkbucket: komanda nerasta
s3mkbucket: Kommando nicht gefunden.
s3mkbucket: kommandot finns inte
s3mkbucket: komut yok
s3mkbucket: nie znaleziono polecenia
s3mkbucket: níor aimsíodh an t-ordú
s3mkbucket: no se encontró la orden
s3mkbucket: no s'ha trobat l'ordre
s3mkbucket: opdracht niet gevonden
s3mkbucket: parancs nem található
s3mkbucket: perintah tidak ditemukan
s3mkbucket: príkaz nenájdený
s3mkbucket: příkaz nenalezen
s3mkbucket: команда не найдена
s3mkbucket: командата не е открита
s3mkbucket: 命令找不到
s3mkbucket: コマンドが見つかりません