puppet: 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/puppet - from package: puppet

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

On Debian possible default full paths are:

/usr/bin/puppet - from package: puppet-common

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

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