traffic_sac: 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/traffic_sac - from package: trafficserver

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

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