fio2gnuplot: 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 Debian possible default full paths are:

/usr/bin/fio2gnuplot - from package: fio

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

Error in other languages:
fio2gnuplot: bevel nie gevind nie
fio2gnuplot: comandă negăsită
fio2gnuplot: comando não encontrado
fio2gnuplot: commande introuvable
fio2gnuplot: command not found
fio2gnuplot: käsku ei ole
fio2gnuplot: không tìm thấy lệnh
fio2gnuplot: komanda nerasta
fio2gnuplot: Kommando nicht gefunden.
fio2gnuplot: kommandot finns inte
fio2gnuplot: komut yok
fio2gnuplot: nie znaleziono polecenia
fio2gnuplot: níor aimsíodh an t-ordú
fio2gnuplot: no se encontró la orden
fio2gnuplot: no s'ha trobat l'ordre
fio2gnuplot: opdracht niet gevonden
fio2gnuplot: parancs nem található
fio2gnuplot: perintah tidak ditemukan
fio2gnuplot: príkaz nenájdený
fio2gnuplot: příkaz nenalezen
fio2gnuplot: команда не найдена
fio2gnuplot: командата не е открита
fio2gnuplot: 命令找不到
fio2gnuplot: コマンドが見つかりません