falcon-bench: 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/falcon-bench - from package: python-falcon

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

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