flushmonitors: 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/share/torrus/bin/flushmonitors - from package: torrus-common

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

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