pgxnclient: 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/pgxnclient - from package: pgxnclient

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

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