fio_generate_plots: 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/fio_generate_plots - from package: fio

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

On Debian possible default full paths are:

/usr/bin/fio_generate_plots - from package: fio

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

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