Remove all commit history

1) Checkout/create orphan branch (this branch won’t show in git branch command):
shell git checkout --orphan latest_branch
2) Add all the files to the newly created branch:
shell git add -A
3) Commit the changes:
shell git commit -am "commit message"
4) Delete main (default) branch (this step is permanent):
shell git branch -D main
5) Rename the current branch to main:
shell git branch -m main
6) Finally, all changes are completed on your local repository, and force update your remote repository:
shell git push -f origin main

SSL certificate problem

unable to get local issuer certificate

git config --global http.sslbackend schannel

in a conflicted state, and you want to just accept all of theirs

git checkout --theirs .
git add .

If you want to do the opposite:

git checkout --ours .
git add .

That limits the delta cache size to one byte (effectively disabling it) instead of the default of 0, which means unlimited

 git config pack.deltaCacheSize 1

removed all of my dangling blobs and dangling commits

removes all references of unreachable commits in reflog.

  git reflog expire --expire-unreachable=now --all

removes the commits themselves.

  git gc --prune=now

  git reflog expire --expire-unreachable=now --all
  git gc --prune=now

or
git gc --aggressive with a later git version
or
git repack -a -f -d --window=250 --depth=250

get all deletes and changes

 git log --shortstat --author "bpaxton"  --since "35 days ago" --until "today" | egrep "file[s]* changed" | sed 's/changed, \([0-9]\+ deletions\)/changed, 0 insertions(+), \1/g' | awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed", files,"total: " inserted - deleted , "lines inserted:", inserted, "lines deleted:", deleted}'

get changed lines

git log --shortstat --author "username"  --since "5 days ago" --until "today" \
    | egrep "file[s]* changed" \
    | sed 's/changed, \([0-9]\+ deletions\)/changed, 0 insertions(+), \1/g' \
    | awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed", files, "lines inserted:", inserted, "lines deleted:", deleted}'

clone set commit

git clone git@github.com:14paxton/ScriptsAndSuch.git .;
git remote set-url origin git@github.com:14paxton/ScriptsAndSuch.git;
git fetch;
#git checkout master;
#git merge origin/master;
git add -A --ignore-errors;
git commit -am "script backup $(date +'%s')";
git push;