bonnie++: 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/sbin/bonnie++ - from package: bonnie++

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

On Debian possible default full paths are:

/usr/sbin/bonnie++ - from package: bonnie++

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

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