ptked: 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 CentOS possible default full paths are:

/usr/bin/ptked - from package: perl-Tk

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ptked - from package: perl-Tk

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

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