podviewer: 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/podviewer - from package: libgtk2-ex-podviewer-perl

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

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