bundler: 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/bundler - from package: rubygem-bundler
/usr/lib/ruby/gems/1.8/gems/bundler-1.5.2/bin/bundler - from package: rubygem-bundler

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

On Debian possible default full paths are:

/usr/bin/bundler - from package: bundler

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

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