babeltrace: 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/babeltrace - from package: babeltrace

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

On Debian possible default full paths are:

/usr/bin/babeltrace - from package: babeltrace

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

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