tcptraceroute: 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/tcptraceroute - from package: tcptraceroute

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

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