bpappend: 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/bpappend - from package: libadios-bin

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

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