ppod2html: 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/ppod2html - from package: perl-Pod-PseudoPod

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

Error in other languages:
ppod2html: bevel nie gevind nie
ppod2html: comandă negăsită
ppod2html: comando não encontrado
ppod2html: commande introuvable
ppod2html: command not found
ppod2html: käsku ei ole
ppod2html: không tìm thấy lệnh
ppod2html: komanda nerasta
ppod2html: Kommando nicht gefunden.
ppod2html: kommandot finns inte
ppod2html: komut yok
ppod2html: nie znaleziono polecenia
ppod2html: níor aimsíodh an t-ordú
ppod2html: no se encontró la orden
ppod2html: no s'ha trobat l'ordre
ppod2html: opdracht niet gevonden
ppod2html: parancs nem található
ppod2html: perintah tidak ditemukan
ppod2html: príkaz nenájdený
ppod2html: příkaz nenalezen
ppod2html: команда не найдена
ppod2html: командата не е открита
ppod2html: 命令找不到
ppod2html: コマンドが見つかりません