pfcat: 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/pfcat - from package: perl-pmtools

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

On Debian possible default full paths are:

/usr/bin/pfcat - from package: pmtools

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

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