lss3: 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 CentOS possible default full paths are:

/usr/bin/lss3 - from package: python2-boto
/usr/bin/lss3 - from package: python-boto

You may install the required package with command yum install {package}

Error in other languages:
lss3: bevel nie gevind nie
lss3: comandă negăsită
lss3: comando não encontrado
lss3: commande introuvable
lss3: command not found
lss3: käsku ei ole
lss3: không tìm thấy lệnh
lss3: komanda nerasta
lss3: Kommando nicht gefunden.
lss3: kommandot finns inte
lss3: komut yok
lss3: nie znaleziono polecenia
lss3: níor aimsíodh an t-ordú
lss3: no se encontró la orden
lss3: no s'ha trobat l'ordre
lss3: opdracht niet gevonden
lss3: parancs nem található
lss3: perintah tidak ditemukan
lss3: príkaz nenájdený
lss3: příkaz nenalezen
lss3: команда не найдена
lss3: командата не е открита
lss3: 命令找不到
lss3: コマンドが見つかりません