aubioquiet: 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/aubioquiet - from package: aubio-tools

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

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