flowgrind: 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/flowgrind - from package: flowgrind

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

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