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I have a large amount of files that were downloaded and ended up having what looks like authentication parameters added to the filename which I would like to remove. Examples:

file1.doc?b1h2uj3b123uiyb12
file2.xls?oi12jo3ij123oij
file3.jpg?0990xcizx0cxzczixuchbiasdu

Is there an easy way for me to strip everything after the question mark on the entire folder of files?

You can match all filenames with a question mark with *?*, and remove the part after the ? from a variable with $var%%?*. The question mark itself is wildcard character, so has to be escaped in both cases.

A simple loop over the files and running mv should do:

for f in ./*?*; do
 echo mv -n "$f" "$f%%?*"
done

(The echo is there so you can see what would be done before any changes being made. Remove it if the output looks sensible.)

Using the Perl rename utility:

$ rename -v -n 's/[?].*//' *[?]*
rename(file1.doc?b1h2uj3b123uiyb12, file1.doc)
rename(file2.xls?oi12jo3ij123oij, file2.xls)
rename(file3.jpg?0990xcizx0cxzczixuchbiasdu, file3.jpg)

This applies the Perl substitution s/[?].*// to each name. This would truncate the name just before the first question mark. The *[?]* filename globbing pattern would expand to any name in the current directory that contains a question mark.

Run the command without -n to actually rename files.