xmtr.bin: 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/xmtr.bin - from package: mtr-gtk

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

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