trace-graph: 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/trace-graph - from package: trace-gui

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

On Debian possible default full paths are:

/usr/bin/trace-graph - from package: kernelshark

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

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