lvdisplay: 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/lvdisplay - from package: lvm2

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

On Debian possible default full paths are:

/sbin/lvdisplay - from package: lvm2

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

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