Can I work on this one? I think I can implement this.

@supreetsingh10: No need to ask permission. In general, for open source projects like Elvish it is sufficient to simply say "I'm going to work on this issue." And a lot of the time even that isn't needed. Having said that, I think you are underestimating the difficulty of this problem relative to your knowledge of Elvish and Go. Take a look at any of my pending pull requests such as PR #1270. All of those address an issue that is no more complicated than this issue. If you understand those changes you might be successful at implementing this feature.

@supreetsingh10: Take a look at PR #1221 which has been abandoned by its author. Given the feedback in that PR you should be able to create a new PR that correctly fixes the problem.

Thank you for the guidance. That is true, I need to get more skilled before I tackle these problems. Thank you Mr. @krader1961.

Mr. @krader1961 I think I have got this problem figured out. I have written some code, it is not enough to be pushed, so I am posting my doubts here, you can reply to them when you have time.

Since I am working on edit:del-var, I am currently in the working in vars.go and I have written and the function delVars(), it is linking with the shell and running. I am using the addVar() to understand how this thing works. I want to ask that am I supposed to add eval.DeleteVarFromName() thing in closure,go as there is a function called MakeVarFromName(), which is making a variable in edit:add-var(), in vars.go. Is there a free() function which I have to use to ````delete a variable```.

@supreetsingh10: Without doing my own investigation of the relevant code I have no idea what the answers are to your questions. This is something you will need to figure out on your own. It is why I have been gently suggesting you try solving easier issues for your initial set of changes. A change that affects the behavior of the eval package is, almost by definition, going to need a good understanding of Elvish internals. Something someone new to the project is unlikely to have.

Mr. @krader1961, your feedbacks and guidance are very important to me, I have been following everything you said, I am also learning Elvish from the guide available. You have asked me to work on simpler things, it is just I have a habit of tinkering with things, that is why I started working on this. Anyway, I will drop this thing for a while and look for a simpler issue. I think elvish is really cool, I just want to learn as much as I can from this project and experienced people who have made this. I am sorry if you felt that I did not listen to you, you helped me throughout the file module, I am very grateful for that.