resperf-report: 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/resperf-report - from package: dnsperf

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

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