The .gitconfig file in my home directory:

examples/gitconfig.txt

[user]
    name = Foo Bar
    email = foo@bar.com

[alias]
    st = status
    co = checkout
    ci = commit

    # Check for conflicts before merging. See https://code-maven.com/git-check-for-conflicts-before-merge
    try = merge --no-commit --no-ff
    files = log --name-only
    lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

    # git impact order --topo-order
    topo = log --color --topo-order --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

    changed = diff-tree -r --no-commit-id --name-only
    last = changed HEAD

    # pull and update submodules
    pullall = !git pull && git submodule update --init --recursive

    plog = log --all --decorate --abbrev-commit --pretty=medium --graph
    meld = difftool --dir-diff

[push]
    default = simple

[core]
    excludesfile = /Users/gabor/.gitignore

[difftool "sourcetree"]
    cmd = opendiff \"$LOCAL\" \"$REMOTE\"
    path = 

[mergetool "sourcetree"]
    cmd = /Users/gabor/Applications/Sourcetree.app/Contents/Resources/opendiff-w.sh \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
    trustExitCode = true

# Location of the commit message template file
[commit]
    template = /Users/gabor/.stCommitMsg

# git pull defaults to git pull --rebase
[pull]
    rebase = true

[diff]
   tool = meld

[difftool]
   prompt = false

[difftool "meld"]
   cmd = meld "$LOCAL" "$REMOTE"

Install meld for better comparing of files

sudo apt-get install meld

List of recently changed files:

git log --name-only --pretty=format:'' -n 20 | grep ^[a-zA-Z0-9] | sort | uniq

An alternative:

git log --before "2019-12-31" --after "2019-12-01"  --name-only | grep -v ^commit | grep -v ^Author | grep -v ^Date: | grep -v '^ ' | grep -v
'^$' | sort | uniq

git log --since="7 days ago"

will show the log for the last 7 days.

Maybe create a shell function:

function files() {
   git log --pretty=format:'' --name-only "$@" | grep \\S | sort | uniq
}

and add it to ~/.bashrc

It allows us to write expressions like

files since="7 days ago"

that will show which files have changed in the last 7 days.

git log --before "2019-12-31" --after "2019-12-01"