pmwtf: 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/libexec/pcp/bin/pmwtf - from package: pcp

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

On Debian possible default full paths are:

/usr/lib/pcp/bin/pmwtf - from package: pcp

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

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