Document in download_raw_data.sh instructions when wget not installed

[erictleung]

What is more sustainable and reasonable?

1. Convert the script to use curL
2. Document what happens when wget is not installed
3. Account for the possibility that one or the other is not installed, so use the other (e.g., https://stackoverflow.com/a/52651894/)

[abalter]

What about something like this:

if has wget:
    use wget
elseif has curl:
    use curl
else:
    print("go get a real OS")

[erictleung]

@abalter yeah, I figured something like that would work.

We have the code for using wget, but I'm not sure off the top of my head what the parameters are for curl that would mirror the same functionality with wget.

This is really low priority, so we don't have to solve this right away. But if one of us has time, we can work on this wget-to-curl translation.

[abalter]

With curl, download the file as opposed to print to screen you use the -O flag. Alternatively, you can just redirect.

curl -O https://raw.githubusercontent.com/ohsu-microbiome/utilities/master/download-utilities/download_raw_data.sh

curl https://raw.githubusercontent.com/ohsu-microbiome/utilities/master/download-utilities/download_raw_data.sh > download_raw_data.sh