powermand: 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/powermand - from package: powerman

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

On Debian possible default full paths are:

/usr/sbin/powermand - from package: powerman

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

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