gpodder: 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 Debian possible default full paths are:

/usr/bin/gpodder - from package: gpodder

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

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