docs: 13 git exercise writeups

Gitwriteups.md

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+# Kabir Git Assignment - 13/13 Exercises
+
+
+Setup Commands:
+
+git clone https://gitexercises.fracz.com/git/exercises.git
+cd exercises
+git config user.name "Ashutosh kumar singh"
+git config user.email "idfor2025@gmail.com"
+./configure.sh
+git start
+
+
+ 1. master
+  Command : `git start master` → `git verify`
+
+  Started on master branch, nothing to change. Just verified it directly. The point was to confirm the starting state is fine as it is.
+
+
+
+ 2. commit-one-file
+Commands: `git add A.txt` → `git commit -m "solved hai"`
+
+Had two files but only needed to stage and commit one. Used "git add" specifically for A.txt so the other file stays untracked.
+
+
+
+ 3. commit-one-file-staged
+Commands:` git reset A.txt ` → `git commit -m "solved" `
+
+Both files were already staged. Used " git reset" to unstage A.txt, then committed only what was left. Reset here doesn't delete anything, just removes from staging area.
+
+
+
+ 4. ignore-them
+Commands: `touch .gitignore` → added `*.exe`, `*.o`, `*.jar`, `libraries/` → `git commit`
+
+Created a .gitignore file and wrote rules to ignore compiled files and the libraries folder. Git reads this file automatically and skips anything matching those patterns.
+
+
+
+ 5. chase-branch
+Commands: `git merge escaped `
+
+The branch `escaped` had commits that master was missing. One merge command brought all those commits into the current branch and fast-forwarded to it.
+
+
+
+ 6. merge-conflict
+Commands: `git merge another-piece-of-work` → `vim equation.txt` → `git commit`
+
+Merging caused a conflict in equation.txt because both branches changed the same line differently. Opened the file in vim, removed the conflict markers, kept the correct version, then committed to finish the merge.
+
+
+
+ 7. save-your-work
+Commands: `git stash` → `vim file.txt` (remove bug) → `git stash pop` → added required line → `git commit`
+
+Had uncommitted work but needed to fix a bug first without losing it. Stashed the work to clean the working directory, fixed the bug, then popped the stash back to restore the original changes and committed everything.
+
+
+
+ 8. change-branch-history
+Commands: `git rebase hot-bugfix`
+
+Needed the current branch to start from hot-bugfix instead of where it originally branched off. Rebase replays the commits on top of the new base, making the history look like it always came from there.
+
+
+
+ 9. remove-ignored-file
+Commands: `git rm --cached ignored.txt` → `git commit -am "Removed"`
+
+The file was already being tracked even though it should have been ignored. `--cached` removes it from tracking without deleting it from disk, then committed to make that removal official.
+
+
+
+ 10. case-sensitive-filename
+Commands: `git mv File.txt file.txt` → `git commit`
+
+Just renaming the file through the OS wouldn't work because Git (especially on Windows/Mac) might not detect the case change. Using `git mv` forces Git to register it as a rename properly.
+
+
+
+ 11. fix-typo
+Commands: `vim file.txt` (fix typo) → `git commit -a --amend`
+
+Fixed the typo in the file then used `--amend` to update the last commit instead of making a new one. Also changed the commit message to something proper at the same time.
+
+
+
+ 12. forge-date
+Commands: `git commit --amend --no-edit --date="<required date>"`
+
+Used `--amend` with `--date` flag to change the timestamp on the last commit. `--no-edit` kept the message same, only the date got updated.
+
+
+
+13. fix-old-typo
+Commands: `git rebase -i HEAD~2` → `vim file.txt` → resolved conflict → `git rebase --continue` → commit
+
+Needed to go back and fix a typo in an older commit, not the latest one. Used interactive rebase to edit that specific commit, fixed the file, then a conflict came up when continuing — resolved it manually and let the rebase finish.