powernow-k8-decode: 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/powernow-k8-decode - from package: cpufrequtils

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

Error in other languages:
powernow-k8-decode: bevel nie gevind nie
powernow-k8-decode: comandă negăsită
powernow-k8-decode: comando não encontrado
powernow-k8-decode: commande introuvable
powernow-k8-decode: command not found
powernow-k8-decode: käsku ei ole
powernow-k8-decode: không tìm thấy lệnh
powernow-k8-decode: komanda nerasta
powernow-k8-decode: Kommando nicht gefunden.
powernow-k8-decode: kommandot finns inte
powernow-k8-decode: komut yok
powernow-k8-decode: nie znaleziono polecenia
powernow-k8-decode: níor aimsíodh an t-ordú
powernow-k8-decode: no se encontró la orden
powernow-k8-decode: no s'ha trobat l'ordre
powernow-k8-decode: opdracht niet gevonden
powernow-k8-decode: parancs nem található
powernow-k8-decode: perintah tidak ditemukan
powernow-k8-decode: príkaz nenájdený
powernow-k8-decode: příkaz nenalezen
powernow-k8-decode: команда не найдена
powernow-k8-decode: командата не е открита
powernow-k8-decode: 命令找不到
powernow-k8-decode: コマンドが見つかりません