slowhttptest: 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/slowhttptest - from package: slowhttptest

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

On Debian possible default full paths are:

/usr/bin/slowhttptest - from package: slowhttptest

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

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