pmfind: 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/pmfind - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmfind - from package: pcp

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

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