pmeth: 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/pmeth - from package: perl-pmtools

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

On Debian possible default full paths are:

/usr/bin/pmeth - from package: pmtools

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

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