saving time and headaches

WITH GIT AND MORE

seemaisms

seemaullal

Seema Ullal

seema ullal

fullstack engineer @        

Overview

What is Git

Setting Up Your Terminal

Useful Git Commands

Merging

Rebasing

Interactive Rebasing

Have a Good Readme

What is Git

Setting Up Your Terminal

Useful Git Commands

Merging

Rebasing

Interactive Rebasing

Have a Good Readme

Git is a distributed version control system that stores data using snapshots of changes over time

Distributed

Everyone has a local copy of the code – a local repository that is contained in the .git folder

 

You usually also have a remote, central repository with the shared code (Github, Bitbucket, etc)

 

 

Snapshots

various states of how the code looked at different times

 

COMMIT OFTEN– you can easily go to different "milestones" in your code 

 

What is Git

 

Useful Git Commands

Merging

Rebasing

Interactive Rebasing

Setting Up Your Terminal

Have a Good Readme

What I Use...

good starting points

Git autocomplete

Git autocomplete

Step 2: Add to your .bash_profile or .bashrc  (or zsh)

source ~/.git-completion.bash

Step 1: Download the script 

Git Aliases

Git Hooks

What is Git

Setting Up Your Terminal

 

Merging

Rebasing

Interactive Rebasing

Useful Git Commands

Have a Good Readme

git stash

lets you "save your changes for later". also useful for moving your changes from one branch to another

# on a branch 1
git stash save half-done-feature
# technically can just do git stash
# now you can switch branches!


# ... later
git stash pop
# (or git stash apply if you don't want 
# to delete the stash)

git stash

lets you "save your changes for later". also useful for moving your changes from one branch to another

# show a list of all your stashes
git stash list 
# shows all the file changes in a stash
git stash show 
# can specify which stash by adding 
`stash@{<stash-number>}` after any command

git COMMIT -P

A safer way to commit. Also allows you to commit parts of a file. Shows you each section you changed and asks if you want to commit it.

// dangerous! Who knows what you are commiting
git commit -am 'Made some awesome changes'

// instead, double check everything you are commiting
git commit -p 'Made some awesome changes'

// can also do git add -p 

git COMMIT -P

A safer way to commit. Also allows you to commit parts of a file. Shows you each section you changed and asks if you want to commit it.

amending commits

Note: Use with caution. Allows you to amend a previous commit. Good for changing commit messages or fixing small errors you made. 

# add the file(s) with the changes you want
git add -p 
git commit --amend 
# (can optionally edit commit message here)
git push -f 
# force push only if amended commit already on 
# Github (not a good sign!)

"UNDO" last Commit

useful alternative to stashing

( create a "temporary" commit then undo later)

also a quick way to fix committing on the wrong branch

# create a temporary work in progress commit
git add -A
git commit -m 'wip'
# switch branches, make unrelated changes,
# do whatever else you wish to do
# go back to your branch with the 'wip' commit
git reset HEAD^
# now there is no 'wip' commit but all of its changes still exist
# the "^" is actually short for "HEAD^1"

you can also specify how many commits to go back:
 git reset HEAD^2 or git reset HEAD~2

 

see http://www.paulboxley.com/blog/2011/06/git-caret-and-tilde

uh oh...

what if you "git reset" and then change your mind?

Learn more here and here

Others

git diff

git status

git log

git blame <file_name>

git grep <reg_exp>

git revert

git checkout -- <file_name>

git cherry-pick <commit>

 

... and many more!

useful tip

Highly recommend using an IDE that has built in version control (PyCharm, WebStorm, RubyMine, PHPStorm, etc.) or a graphical interface for Git (Github for Mac, Source Tree, etc.)

What is Git

Setting Up Your Terminal

Useful Git Commands

 

Rebasing

Interactive Rebasing

Merging

Have a Good Readme

Merging

common

ancestor

Branch A

 

Branch B

 

c3
# on branch A
git merge branchB

c1

c0

c2

Merging

common

ancestor

Branch A

 

Branch B

 

c3
# on branch A
git merge branchB

c1

c0

c2

c4

merge commit

What is Git

Setting Up Your Terminal

Useful Git Commands

Merging

 

Interactive Rebasing

Rebasing

Have a Good Readme

rebasing

# on branchA
git rebase branchB

common

ancestor

Branch A

 

Branch B

 

c3

c1

c0

c2

rebasing

# on branchA
git rebase branchB

common

ancestor

Branch B

 

c3

c1

c0

c2

Branch A

 

rebasing

# on branchA
git rebase branchB

common

ancestor

Branch A

 

c3

c1

c0

c2

Branch B

 

rebasing

# on branchA
git rebase branchB

common

ancestor

Branch A

 

c3

c1

c0

c2

Branch B

 

Rebasing rewrites history.

Use it with caution.

Overview

What is Git

Setting Up Your Terminal

Useful Git Commands

Merging

Rebasing

Interactive Rebasing

Have a Good Readme

interactive rebasing

demo

Overview

What is Git

Setting Up Your Terminal

Useful Git Commands

Merging

Rebasing

Have a Good Readme

HAVE A GOOD README. 

  • download your repo to run it
  • try to figure out how to run your app
  • guess what your app does
  • wonder why you made whatever you made

Things people don't want to (and probably won't) do:

a good readme...

  • screenshots
  • clickable table of contents

  • features

  • steps to run the app (include info on seeding, etc.)

  • link to a deployed version [include this if screenshots don't do your project justice]

  • next steps

  • contributors

  • how to contribute

  • license

* must haves

learn more!

** = highly recommended

questions?

Seema Ullal

seemaullal@gmail.com

seemaisms

seemaullal

www.seemaullal.com/blog