moggsplit: 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/moggsplit - from package: python-mutagen

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

On Debian possible default full paths are:

/usr/bin/moggsplit - from package: python-mutagen

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

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