ptable: 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/ptable - from package: xcrysden

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

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