flowdumper: 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 CentOS possible default full paths are:

/usr/bin/flowdumper - from package: perl-Cflow

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/flowdumper - from package: libcflow-perl

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

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