bdgdiff: 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/bdgdiff - from package: macs

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

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