bashdb: 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/bashdb - from package: bashdb

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

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