pound: 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/sbin/pound - from package: Pound

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

On Debian possible default full paths are:

/usr/sbin/pound - from package: Pound

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

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