vgexport: 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:

/sbin/vgexport - from package: lvm2

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

On Debian possible default full paths are:

/sbin/vgexport - from package: lvm2

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

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