bdecode: 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/bdecode - from package: mirrorbrain-tools

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

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