httppower: 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/sbin/httppower - from package: powerman

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

On Debian possible default full paths are:

/usr/sbin/httppower - from package: powerman

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

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