btcopyannounce: 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/btcopyannounce - from package: bittornado

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

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