vdb_view: 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 Debian possible default full paths are:

/usr/bin/vdb_view - from package: libopenvdb-tools

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

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