belvu: 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/belvu - from package: acedb-other-belvu

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

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