sysbench: 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/sysbench - from package: sysbench

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

On Debian possible default full paths are:

/usr/bin/sysbench - from package: sysbench

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

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