tracepath6: 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:

/bin/tracepath6 - from package: iputils
/usr/sbin/tracepath6 - from package: iputils

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

On Debian possible default full paths are:

/usr/bin/tracepath6 - from package: iputils-tracepath

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

Error in other languages:
tracepath6: bevel nie gevind nie
tracepath6: comandă negăsită
tracepath6: comando não encontrado
tracepath6: commande introuvable
tracepath6: command not found
tracepath6: käsku ei ole
tracepath6: không tìm thấy lệnh
tracepath6: komanda nerasta
tracepath6: Kommando nicht gefunden.
tracepath6: kommandot finns inte
tracepath6: komut yok
tracepath6: nie znaleziono polecenia
tracepath6: níor aimsíodh an t-ordú
tracepath6: no se encontró la orden
tracepath6: no s'ha trobat l'ordre
tracepath6: opdracht niet gevonden
tracepath6: parancs nem található
tracepath6: perintah tidak ditemukan
tracepath6: príkaz nenájdený
tracepath6: příkaz nenalezen
tracepath6: команда не найдена
tracepath6: командата не е открита
tracepath6: 命令找不到
tracepath6: コマンドが見つかりません