My first Unix machine (os x), I just decided to go with JEdit!! Why isn't that even on the list??

It is not on the list because no one has ever requested it in many years.

You are the first

Note that the vast majority of people prefer text editors because you cannot ssh into a server and run a graphical editor when you have a system problem (one reason of a number of reasons a powerful, universal text editor is the preferred editor for most folks).

well... I'm okay with vi, I use it when I'm trying to edit something quickly from the terminal, but if I can't imagine starting a project in even nano.

Also, jedit has been really going on my nerves!!! I'm not committed. Still searching for a better one... I want one that recognizes the code (at least tcl and c++), have tabs to keep many files open, search for where variables are set, etc. And be free of course

firstly how to know that which editor present on our system.

Is there any command to find out?

Try "which" followed by the name of some of the more common ones (emacs, vi, vim, nano, pico), one at a time to keep the returned strings simple. I find this method safer than just arbitrarily entering a command (the name of one) and finding out I can't exit it without terminating the shell session (or worse).

Whichever one comes up with a path to an executable, like /usr/bin/emacs2 instead of a lot of garbage telling you where editor x isn't in your execution or environment paths, that's the one you have.

And you may have more than one. Try them out and see which one you're more attuned to.

BZT

I use vi on all system where I have shell, but I also love KomodoEdit - it's free, and they support "vi bindings" so I can have the best of all things... including code completion/hints, templates, projects, etc. while still being able to maneuver efficiently using vi commands.

I found a pretty good editor when I am on my XP box called Notepad++

I've been writing some PHP/MySQL code on my XP laptop, and it works pretty good