pduclient: 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/pduclient - from package: lavapdu-client

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

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