tbench_srv: 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_srv - from package: dbench

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

On Debian possible default full paths are:

/usr/bin/tbench_srv - from package: dbench

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

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