be: 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/be - from package: bugs-everywhere

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

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