tbench: 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/tbench - from package: dbench

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

On Debian possible default full paths are:

/usr/bin/tbench - from package: dbench

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

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