sumo: 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/sumo - from package: sumo

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

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