pmfunc: 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/pmfunc - from package: perl-pmtools

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

On Debian possible default full paths are:

/usr/bin/pmfunc - from package: pmtools

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

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