ovs-ofctl: 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/ovs-ofctl - from package: openvswitch-common

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

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