vorbiscomment: 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/vorbiscomment - from package: vorbis-tools

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

On Debian possible default full paths are:

/usr/bin/vorbiscomment - from package: vorbis-tools

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

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