General documentation / cheat sheets for various languages and services

CLI

git status
On branch master Your branch is ahead of 'origin/master' by 1 commit. (use "git push" to publish your local commits) Changes to be committed: (use "git reset HEAD <file>..." to unstage) modified: app.jsx modified: site.less Changes not staged for commit: (use "git add <file>..." to update what will be committed) (use "git checkout -- <file>..." to discard changes in working directory) modified: build/bundle.js
git status -s
git status --short
M app.jsx M build/bundle.js M site.less
git branch -d fix-app-loader
Delete the fix-app-loader local branch only if it has been merged.
git branch -D demo-app-loader-idea
Delete the demo-app-loader-idea local branch even if it hasn't been merged.
git push origin --delete pr-2042
git push origin :pr-2042
Delete the pr-2042 remote branch.
git ls-files --ignored --exclude-standard
List the files that are currently tracked, but are configured to be ignored by .gitignore or ~/.gitignore_global.ref
git show HEAD^ --color-words
Show word-level patch diff of second-to-last commit. Deletes are red, additions are green.
git log --oneline --graph --all --decorate --simplify-by-decoration
  • --oneline pretty prints the commit hash and message to fit on one line.
  • --graph draws a tree-stylized graph of the different branches
  • --all include all available refs, not just the ones headed to the current branch (I think that's what it does)
  • --decorate prints the branch(es) terminating at that commit.
  • --simplify-by-decoration omits commits that are not decorated (which are usually less significant commits)
git diff -- ':!build'
Compute the diff as usual, but exclude everything matching build.ref This also works for other commands, like status.

Templates (especially hooks/)

When you run git init, git creates a new .git/ directory with files like config and HEAD, and subdirectories objects and refs, which are all required by git for its basic functionality. It also recursively copies everything from a “template” directory into that newly-created .git/ directory.

The template directory can be specified by supplying the --template /path/to/template option to git init, or setting a $GIT_TEMPLATE_DIR environment variable, or having configured the init.templateDir in your git configuration.

Or, if none of those are set, it will use /usr/share/git-core/templates. For the Homebrew-installed git on macOS, git is built with the prefix /usr/local instead of /usr, so the actual default directory is /usr/local/share/git-core/templates. (That directory is symlinked to /usr/local/Cellar/git/*/share/git-core/templates – replace the * with your current version.)

That default template includes several sample “hooks”, which are all disabled by default (due to the .sample suffix). I rarely use git hooks, so all those (duplicate) samples serve to just clutter up my filesystem. (They’re tiny, but there’s nearly a dozen of them; they add up!)

To trim down the templates, create a new directory with just the files you want. I’ll use ~/.config/git/templates, since ~/.config/git is the default directory for many other git configuration files.

Then, to start using that as the templates directory for all new repositories, simply run:

git config --global --add init.templateDir ~/.config/git/templates

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