rest-bench: 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/rest-bench - from package: rest-bench

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

On Debian possible default full paths are:

/usr/bin/rest-bench - from package: rest-bench

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

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