btyacc: 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/btyacc - from package: btyacc

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

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