faust2csound: command not found

Have You tried accessing the binary with the full path?

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/faust2csound - from package: faust

You may install the required package with command apt-get install {package}
Error in other languages:
faust2csound: bevel nie gevind nie
faust2csound: comandă negăsită
faust2csound: comando não encontrado
faust2csound: commande introuvable
faust2csound: command not found
faust2csound: käsku ei ole
faust2csound: không tìm thấy lệnh
faust2csound: komanda nerasta
faust2csound: Kommando nicht gefunden.
faust2csound: kommandot finns inte
faust2csound: komut yok
faust2csound: nie znaleziono polecenia
faust2csound: níor aimsíodh an t-ordú
faust2csound: no se encontró la orden
faust2csound: no s'ha trobat l'ordre
faust2csound: opdracht niet gevonden
faust2csound: parancs nem található
faust2csound: perintah tidak ditemukan
faust2csound: príkaz nenájdený
faust2csound: příkaz nenalezen
faust2csound: команда не найдена
faust2csound: командата не е открита
faust2csound: 命令找不到
faust2csound: コマンドが見つかりません