pm-action: 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/lib64/pm-utils/bin/pm-action - from package: pm-utils

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

On Debian possible default full paths are:

/usr/lib/pm-utils/bin/pm-action - from package: pm-utils

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

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