httperf: 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/httperf - from package: httperf

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

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