pmacctd: 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 Debian possible default full paths are:

/usr/sbin/pmacctd - from package: pmacct

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

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