pmdate: 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/pmdate - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmdate - from package: pcp

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

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