git: move to development

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+# git(1)
+
+## Working areas
+```text
++-------------------+ --- stash -----> +-------+
+| working directory |                  | stash |  // Shelving area.
++-------------------+ <-- stash pop -- +-------+
+      |       ^
+     add      |
+      |     reset
+      v       |
++-------------------+
+|   staging area    |
++-------------------+
+      |
+    commit
+      |
+      v
++-------------------+
+| local repository  |
++-------------------+
+      |       ^
+     push     |
+      |     fetch /
+      |      pull
+      v       |
++-------------------+
+| remote repository |
++-------------------+
+```
+
+## Config
+```markdown
+  git config --list --show-origin ..... list currently set configs and where
+                                        they are coming from
+  git --edit [--global] ............... open config in editor (local or global)
+```
+
+## Clean
+```markdown
+  git clean -X ......... remove only ignored files (-n for dry run)
+  git clean -f -d -x ... remove untracked & ignored files / folders
+  git clean -e <pat> ... exclude pattern from deletion
+```
+
+## Staging
+```markdown
+  git add -p [<file>] ............ partial staging (interactive)
+```
+
+## Remote
+```markdown
+  git remote -v .................. list remotes verbose (with URLs)
+  git remote show [-n] <remote> .. list info for <remote> (like remote HEAD,
+                                   remote branches, tracking mapping)
+```
+
+## Branching
+```markdown
+  git branch [-a] ................ list available branches; -a to include
+                                   remote branches
+  git branch -vv ................. list branch & annotate with head sha1 &
+                                   remote tracking branch
+  git branch <bname> ............. create local branch with name <bname>
+  git branch -d <bname> .......... delete local branch with name <bname>
+  git checkout <bname> ........... switch to branch with name <bname>
+  git checkout --track <branch> .. start to locally track a remote branch
+  git branch --unset-upstream .... unset remote tracking branch
+
+  # Remote
+
+  git push -u origin <rbname> ........ push local branch to origin (or other
+                                       remote), and setup <rbname> as tracking
+                                       branch
+  git push origin --delete <rbname> .. delete branch <rbname> from origin (or
+                                       other remote)
+```
+
+## Update local from remote
+```markdown
+  git fetch --prune .................. update all remote references and
+                                       remove delete non-existing ones
+                                       (does not merge into local tracking branch)
+  git pull [--rebase] ................ fetch remote references and merge into
+                                       local tracking branch (fast-forward by default).
+                                       Optionally rebase local tracking branch
+                                       on-top of remote branch (in case local
+                                       branch has additional commits compared to remote branch).
+```
+
+## Tags
+```markdown
+  git tag -a <tname> -m "descr" ........ creates an annotated tag (full object
+                                         containing tagger, date, ...)
+  git tag -l ........................... list available tags
+  git checkout tag/<tname> ............. checkout specific tag
+  git checkout tag/<tname> -b <bname> .. checkout specific tag in a new branch
+
+  # Remote
+
+  git push origin --tags .... push local tags to origin (or other remote)
+```
+
+## Merging
+```markdown
+  git merge [opt] <commit> .... integrate changes from <commit> since
+    opt:                        current branch and <commit> diverged
+      --squash ................ merge all commits into a single one
+      --no-commit ............. dont generate commit if the merge succeeds
+
+  git merge-base <commit> <commit>
+                                get the common ancestor, since both commits diverged
+
+  git rebase -i <upstream> .... interactively rebase on <upstream>, also supports actions
+                                like squashing, editing, rewording, etc of commits
+
+  git cherry-pick <commit> .... apply commit on current branch
+```
+
+## Worktree
+Worktrees allow to maintain multiple working trees in the filesystem linked to
+the same repository (shared .git folder).
+```markdown
+  git worktree add <path> .............. create a tree at <path> with a new branch
+                                         checked out (bname is basename of <path>)
+  git worktree add <path> <bname> ...... create a tree at <path> from existing <bname>
+  git worktree list .................... list existing work trees
+  git worktree remove <tree> ........... remove work tree
+  git worktree prune ................... remove stale bookkeeping files
+```
+
+## Log & Commit History
+```markdown
+  git log --oneline ......... shows log in single line per commit -> alias for
+                              '--pretty=oneline --abbrev-commit'
+  git log --graph ........... text based graph of commit history
+  git log --decorate ........ decorate log with REFs
+
+  git log -p <file> ......... show commit history + diffs for <file>
+  git log --oneline <file> .. show commit history for <file> in compact format
+```
+
+## Diff & Commit Info
+```markdown
+  git diff <commit>..<commit> [<file>] .... show changes between two arbitrary
+                                            commits. If one <commit> is omitted
+                                            it is if HEAD is specified.
+  git diff --name-only <commit>..<commit> . show names of files changed
+  git diff -U$(wc -l <file>) <file> ....... shows complete file with diffs
+                                            instead of usual diff snippets
+  git diff --staged ....................... show diffs of staged files
+
+  git show --stat <commit> ................ show files changed by <commit>
+  git show <commit> [<file>] .............. show diffs for <commit>
+
+  git show <commit>:<file> ................ show <file> at <commit>
+```
+
+## Patching
+```markdown
+  git format-patch <opt> <since>/<revision range>
+    opt:
+      -N ................... use [PATCH] instead [PATCH n/m] in subject when
+                             generating patch description (for patches spanning
+                             multiple commits)
+      --start-number <n> ... start output file generation with <n> as start
+                             number instead '1'
+    since spcifier:
+      -3 .................. e.g: create a patch from last three commits
+      <commit hash> ....... create patch with commits starting after <commit hash>
+
+  git am <patch> ......... apply patch and create a commit for it
+
+  git apply --stat <PATCH> ... see which files the patch would change
+  git apply --check <PATCH> .. see if the patch can be applied cleanly
+  git apply [-3] <PATCH> ..... apply the patch locally without creating a commit,
+                               if the patch does not cleanly apply -3 allows for
+                               a 3-way merge
+
+  # eg: generate patches for each commit from initial commit on
+  git format-patch -N $(git rev-list --max-parents=0 HEAD)
+
+  # generate single patch file from a certain commit/ref
+  git format-patch <COMMIT/REF> --stdout > my-patch.patch
+```
+
+## Resetting
+```markdown
+  git reset [opt] <ref|commit>
+    opt:
+      --mixed .................... resets index, but not working tree
+      --hard ..................... matches the working tree and index to that
+                                   of the tree being switched to any changes to
+                                   tracked files in the working tree since
+                                   <commit> are lost
+  git reset HEAD <file> .......... remove file from staging
+  git reset --soft HEAD~1 ........ delete most recent commit but keep work
+  git reset --hard HEAD~1 ........ delete most recent commit and delete work
+```
+
+## Submodules
+```markdown
+  git submodule add <url> [<path>] .......... add new submodule to current project
+  git clone --recursive <url> ............... clone project and recursively all
+                                              submodules (same as using
+                                              'git submodule update --init
+                                              --recursive' after clone)
+  git submodule update --init --recursive ... checkout submodules recursively
+                                              using the commit listed in the
+                                              super-project (in detached HEAD)
+  git submodule update --remote <submod> .... fetch & merge remote changes for
+                                              <submod>, this will pull
+                                              origin/HEAD or a branch specified
+                                              for the submodule
+  git diff --submodule ...................... show commits that are part of the
+                                              submodule diff
+```
+
+## Inspection
+```markdown
+  git ls-tree [-r] <ref> .... show git tree for <ref>, -r to recursively ls sub-trees
+  git show <obj> ............ show <obj>
+  git cat-file -p <obj> ..... print content of <obj>
+```
+
+## Revision Specifier
+```markdown
+  HEAD ........ last commit
+  HEAD~1 ...... last commit-1
+  HEAD~N ...... last commit-N (linear backwards when in tree structure, check
+                difference between HEAD^ and HEAD~)
+  git rev-list --max-parents=0 HEAD ........... first commit
+```