oggz-merge: 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/oggz-merge - from package: liboggz

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

On Debian possible default full paths are:

/usr/bin/oggz-merge - from package: oggz-tools

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

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