Adding info on aliases

[tomwright01]

Added info on 'why use aliases'

[tomwright01]

Whoops, didn't mean to push this back the the swcarpentry repository.

[rgaiacs]

First I'm reopening this PR since it was close by accident.

@tomwright01 Thanks very much for your PR. I'm against add aliases to novice lesson because we already too much information.

I know that aliases is very useful (for example, make diff's -Z default) but since scripts can solve the same problems target by aliases and others I'm +1 to avoid talk about aliases for novices.

[gdevenyi]

How about we redirect this to a full-fledged lesson in novice/extras, it's clearly good material

[tomwright01]

I liked the location of this material in the scripting lesson as a simple example of how we can use the shell to 'simplify' our lives. As it stands I don't think there is enough information for a seperate lesson, however at some point I would be happy to add infomation editing .bashrc add persistence.
Any other good examples of alias use would be welcome.

[ethanwhite]

I agree with @r-gaia-cs that we should avoid this in the novice lessons since there is already a lot of material for a 3 hour chunk of workshop. I think adding it to novice/extras as @gdevenyi suggests or adding it to intermediate/shell would both be good options.

We are generally short on material in the intermediate sections, so even if this feels like there isn't enough information here for a separate lesson it would be a valuable starting point.

[gvwilson]

Please redirect to intermediate/shell and we'll merge before #759.

[gdevenyi]

@tomwright01 Can you modify this PR to be a set of new lesson in intermediate/shell

We want to get this into the bc repo before we split bc into individual repos (discussion at #759 )

If you don't have time to do so soon, we'll have to close this and you can reopen a PR on the new shell repo

[tomwright01]

Hi,
Not really sure how to do this, and probably won't have time in the next couple of weeks. I was thinking this would make a separate lesson on 'customising the shell' in intermediate. Feel free to close this PR and I'll open a new one when I have time to create some new material.