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***<code>git reset</code> - update the staging area, and perhaps working directory, with files from another commit (e.g., HEAD)
***<code>git checkout</code> - switch to a branch or commit, or create, or get files from a branch/commit
== Week 5 ==
* [https://github.com/humphd/hacktoberfest-at-seneca-2018 Release 0.2: Hacktoberfest]
** For Tuesday October 9th (Lab 3)
*** First (of 5) PR completed with a Blog Post
*** Submit via https://github.com/humphd/hacktoberfest-at-seneca-2018/wiki/Student-Submissions
** Add projects that you think are good for other students to https://github.com/humphd/hacktoberfest-at-seneca-2018/wiki/Interesting-Open-Source-Projects
* Merging with git
** Where <code>git branch</code> splits histories apart, <code>git merge</code> brings them back together
** Understanding DIFFs and Patch files
*** <code>git diff</code>, <code>git show</code>, <code>git log -p</code>, etc. to show DIFFs
*** [https://github.com/filerjs/filer/pull/395 Pull Requests] also have links to get the raw [https://patch-diff.githubusercontent.com/raw/filerjs/filer/pull/395.diff .diff] and [https://patch-diff.githubusercontent.com/raw/filerjs/filer/pull/395.patch .patch]
*** [https://blog.humphd.org/vocamus-906/ How to read a DIFF file]
** Types of Merges: Fast Forward, Recursive Merges are the most common
*** <code>--ff-only</code> to force a fast-forward (only the branch pointer is moved, no new commit is created)
*** 3-way merges: two branch commits with a common ancestor (new commit is created with multiple parents)
*** Can have any number of parents though: one of the larges is a 66 commit octopus merge in the Linux kernel
** How to merge
*** start with a clean working directory
**** <code>commit</code> your work if you can; or
**** <code>stash</code> (<code>git stash list</code>, <code>git stash show</code>, <code>git stash pop</code>)
*** checkout the branch you want to merge '''into'''
*** <code>git merge branch_to_merge_into_this_branch</code>
** Various flags and commands to know:
*** <code>git merge --squash</code>
*** <code>git merge --abort</code>
*** <code>git merge --continue</code>
*** <code>git branch -d</code>
** [https://blog.humphd.org/fearless-merges/ Doing big merges in git]