Git show files that were changed in the last 2 days

git diff --stat @{2.days.ago} # Deprecated!, see below

Short and effective

Edit

TLDR: use git diff $(git log -1 --before=@{2.days.ago} --format=%H) --stat

Long explanation: The original solution was good, but it had a little glitch, it was limited to the reflog, in other words, only shows the local history, because reflog is never pushed to remote. This is the reason why you get the warning: Log for 'master' only goes back to... in repos recently cloned.

I have configured this alias in my machine:

alias glasthour='git diff $(git log -1 --before=@{last.hour} --format=%H) --stat' 
alias glastblock='git diff $(git log -1 --before=@{4.hours.ago} --format=%H) --stat' 
alias glastday='git diff $(git log -1 --before=@{last.day} --format=%H) --stat' 
alias glastweek='git diff $(git log -1 --before=@{last.week} --format=%H) --shortstat | uniq' 
alias glastmonth='git diff $(git log -1 --before=@{last.month} --format=%H) --shortstat | uniq'                                                                                                                

credits: answer below by @adam-dymitruk

git log --pretty=format: --name-only --since="2 days ago"

if some files duplicate in multiple commits, you can use pipe to filter it

git log --pretty=format: --name-only --since="2 days ago" | sort | uniq

Use the --raw option to git log:

$ git log --raw --since=2.days

See the --diff-filter part of the git log help page for the explanation of the flags shown in the --raw format. They explain what happen to the files in each commit:

   --diff-filter=[(A|C|D|M|R|T|U|X|B)...[*]]
       Select only files that are Added (A), Copied (C), Deleted (D),
       Modified (M), Renamed (R), have their type (i.e. regular file,
       symlink, submodule, ...) changed (T), are Unmerged (U), are Unknown
       (X), or have had their pairing Broken (B). Any combination of the
       filter characters (including none) can be used. When *
       (All-or-none) is added to the combination, all paths are selected
       if there is any file that matches other criteria in the comparison;
       if there is no file that matches other criteria, nothing is
       selected.