winpdb: 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/winpdb - from package: winpdb

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

On Debian possible default full paths are:

/usr/bin/winpdb - from package: winpdb

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

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