tcbench: 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/tcbench - from package: VirtualGL

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

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