pmacct: 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/bin/pmacct - from package: pmacct

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

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