oggSplit: 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/oggSplit - from package: oggvideotools

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

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