UTscapy: 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/UTscapy - from package: scapy

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

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