pmtime: 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/pmtime - from package: pcp-gui

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

On Debian possible default full paths are:

/usr/bin/pmtime - from package: pcp-gui

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

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