s3curl: 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/s3curl - from package: s3curl

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

Error in other languages:
s3curl: bevel nie gevind nie
s3curl: comandă negăsită
s3curl: comando não encontrado
s3curl: commande introuvable
s3curl: command not found
s3curl: käsku ei ole
s3curl: không tìm thấy lệnh
s3curl: komanda nerasta
s3curl: Kommando nicht gefunden.
s3curl: kommandot finns inte
s3curl: komut yok
s3curl: nie znaleziono polecenia
s3curl: níor aimsíodh an t-ordú
s3curl: no se encontró la orden
s3curl: no s'ha trobat l'ordre
s3curl: opdracht niet gevonden
s3curl: parancs nem található
s3curl: perintah tidak ditemukan
s3curl: príkaz nenájdený
s3curl: příkaz nenalezen
s3curl: команда не найдена
s3curl: командата не е открита
s3curl: 命令找不到
s3curl: コマンドが見つかりません