mv: rename remove_destination keyword to force

[StefanKarpinski]

I can never remember this keyword name. It's way too long and this kind of option is almost always called force in UNIX commands, which is what we model our file system API on.

[StefanKarpinski]

While we're at this, we may want to look at other file API functions and make sure they have consistent keyword names. I.e. force and recursive.

[JeffBezanson]

cp also has this argument.

[ranjan-sh]

I would like to work on this, if it's alright with everyone.
I am new to the community,so where and how should I start?

[StefanKarpinski]

Hi, @turing93. Thanks for the help! First check out

https://github.com/JuliaLang/julia/blob/master/CONTRIBUTING.md

Keep the advice there in mind. For this particular change, you'll want to add the force keyword and keep the old remove_destination keyword but change its default to nothing. If any value is supplied for remove_destination print a deprecation warning (there are various places in the code base that do this, so find one and do something similar) and overwrite the default value of force with it. Then change all usages of the functions that you update (mv and cp). After that run make testall and check that all the tests pass. Beware that this can take a long while and use a lot of CPU. You may want to get on the Julia Slack and ask questions in the #my-first-pr channel on there.