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Git presentation

This document provides an overview of version control systems and the basic commands and workflows in Git. It explains that version control systems allow recording changes to files over time so that specific versions can be recalled. It then covers the basic Git commands for recording changes (add, commit), viewing history (log, diff), undoing changes (reset, checkout, amend), and collaborating remotely (push, pull, fetch). It also discusses branching workflows in Git for diverging and merging lines of development.

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A System that records changes to files over time, so that you can recall specific versions later. Version Control System
Alice Version Control System Local Centralized Distributed vers.3 vers.2 vers.1 File vers.3 vers.2 vers.1 File File Alice Bob File v.3 v.2 v.1 Bob File v.3 v.2 v.1 vers.3 vers.2 vers.1
Git Basic Working Directory Staging Area Repository
Git Basic Working Directory Staging Area Repository My File
Git Basic Working Directory Staging Area Repository My File git add changes to My File
Git Basic Working Directory Staging Area Repository My File git add git commit changes to My File
Local Git Basic Working Directory Staging Area Repository My File git add git commit changes to My File
Git Basic Local Working Directory Staging Area Repository My File git add git commit changes to My File
Git Basic Local Working Directory Staging Area Repository My File git add git commit changes to My File Remote
Git Basic Local Working Directory Staging Area Repository My File git add git commit changes to My File Remote git push
3 States Working Directory Staging Area Repository Modified Staged Committed
git 101
Recording Changes History of Changes Undo Going Remote
git status Recording Changes show in which state a file is: modified, staged, committed Working Directory Staging Area Repository
git status Recording Changes show in which state a file is: modified, staged, committed Working Directory Staging Area Repository ≠ ≠
git diff Recording Changes shows changed made but not yet staged --staged shows changes staged but not yet committed Working Directory Staging Area Repository
git diff Recording Changes shows changed made but not yet staged --staged shows changes staged but not yet committed Working Directory Staging Area Repository diff diff --staged
git add <file, dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository
git add <file, dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody”
git add <file, dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
git add <file, dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
git rm <file, dir> Recording Changes Removes the specified file(s) from staging area and current --cached do not remove the file from the working directory Working Directory Staging Area Repository foo.rb bar.rb foobar.rb foo.rb bar.rb foobar.rb
git rm <file, dir> Recording Changes Removes the specified file(s) from staging area and current --cached do not remove the file from the working directory Working Directory Staging Area Repository foo.rb bar.rb foobar.rb foo.rb bar.rb foobar.rb
git commit Recording Changes Saves the changes made in the staging area to the repository Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
git commit Recording Changes Saves the changes made in the staging area to the repository Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
git log History of Changes Lists informations about commits in reverse chronological order commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number commit 085bb3bcb608e1e8451d4b2432f8ecbe6306e7e7 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 16:40:33 2008 -0700 removed unnecessary test commit a11bef06a3f659402fe7563abf99ad00de2209e6 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 10:31:28 2008 -0700 first commit
git log History of Changes Lists informations about commits in reverse chronological order commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number commit 085bb3bcb608e1e8451d4b2432f8ecbe6306e7e7 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 16:40:33 2008 -0700 removed unnecessary test commit a11bef06a3f659402fe7563abf99ad00de2209e6 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 10:31:28 2008 -0700 first commit
git log -p History of Changes Shows differences introduced by every commit commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number diff --git a/Rakefile b/Rakefile index a874b73..8f94139 100644 --- a/Rakefile +++ b/Rakefile @@ -5,7 +5,7 @@ require 'rake/gempackagetask' spec = Gem::Specification.new do |s| s.platform = Gem::Platform::RUBY s.name = "simplegit" - s.version = "0.1.0" + s.version = "0.1.1" s.author = "Scott Chacon" s.email = "schacon@gee-mail.com" s.summary = "A simple gem for using Git in Ruby code."
git log -p History of Changes Shows differences introduced by every commit commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number diff --git a/Rakefile b/Rakefile index a874b73..8f94139 100644 --- a/Rakefile +++ b/Rakefile @@ -5,7 +5,7 @@ require 'rake/gempackagetask' spec = Gem::Specification.new do |s| s.platform = Gem::Platform::RUBY s.name = "simplegit" - s.version = "0.1.0" + s.version = "0.1.1" s.author = "Scott Chacon" s.email = "schacon@gee-mail.com" s.summary = "A simple gem for using Git in Ruby code." Where What
git log OPTIONS History of Changes --stat shows list of modified files -1 -2 -n shows last commit shows last 2 commits shows last n commits -S<string> only shows commits adding/removing <string>
git commit --amend Undo takes changes in staging area and adds them to the previous commit Working Directory Staging Area Repository list of changes
git commit --amend Undo takes changes in staging area and adds them to the previous commit Working Directory Staging Area Repository list of changes
git reset HEAD <file> Undo Removes the selected file from the staging area Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
git reset HEAD <file> Undo Removes the selected file from the staging area Working Directory Staging Area Repository puts “Hello World Everybody”
git checkout -- <file> Undo Discards changes of the file in the working directory Working Directory Staging Area Repository puts “Hello World Everybody”
git checkout -- <file> Undo Discards changes of the file in the working directory Working Directory Staging Area Repository puts “Hello World Everybody” puts “Hello World”
git push <remote_name> <branch_name> Going Remote Shares the modifications with the remote repository Local Working Directory Staging Area Repository My File changes to My File Remote master branch
git push <remote_name> <branch_name> Going Remote Shares the modifications with the remote repository Local Working Directory Staging Area Repository My File changes to My File Remote git push master branch
git fetch <remote_name> Going Remote Retrieves data from the remote repository (do not merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3
git fetch <remote_name> Going Remote Retrieves data from the remote repository (do not merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3 5 4
git pull Going Remote Retrieves data from the remote repository (and merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3
git pull Going Remote Retrieves data from the remote repository (and merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 4 5 3
Branching
branch: you diverge from the main line of development and continue to do work without messing with that main line
master
master mybranch $ git branch mybranch
master mybranch $ git branch mybranch $ git checkout mybranch
master mybranch $ git branch mybranch $ git checkout mybranch $ git commit
master mybranch $ git branch mybranch $ git checkout mybranch $ git commit $ git commit
master mybranch $ git branch mybranch $ git checkout mybranch $ git commit $ git commit $ git checkout master
Merging
master mybranch
master mybranch $ git checkout master
mybranch master $ git checkout master $ git merge mybranch
master mybranch
mybranch master $ git commit
mybranch $ git commit master $ git merge mybranch
wants you to branch&merge

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Git presentation

  • 1.
  • 2.
    A System thatrecords changes to files over time, so that you can recall specific versions later. Version Control System
  • 3.
    Alice Version Control System LocalCentralized Distributed vers.3 vers.2 vers.1 File vers.3 vers.2 vers.1 File File Alice Bob File v.3 v.2 v.1 Bob File v.3 v.2 v.1 vers.3 vers.2 vers.1
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
    Git Basic Local Working Directory Staging Area Repository My File gitadd git commit changes to My File Remote git push
  • 12.
  • 13.
  • 14.
    Recording Changes History ofChanges Undo Going Remote
  • 15.
    git status Recording Changes showin which state a file is: modified, staged, committed Working Directory Staging Area Repository
  • 16.
    git status Recording Changes showin which state a file is: modified, staged, committed Working Directory Staging Area Repository ≠ ≠
  • 17.
    git diff Recording Changes showschanged made but not yet staged --staged shows changes staged but not yet committed Working Directory Staging Area Repository
  • 18.
    git diff Recording Changes showschanged made but not yet staged --staged shows changes staged but not yet committed Working Directory Staging Area Repository diff diff --staged
  • 19.
    git add <file,dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository
  • 20.
    git add <file,dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody”
  • 21.
    git add <file,dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
  • 22.
    git add <file,dir> Recording Changes “prepare this content for the next commit” saves only current modifications, not futures modifications Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
  • 23.
    git rm <file,dir> Recording Changes Removes the specified file(s) from staging area and current --cached do not remove the file from the working directory Working Directory Staging Area Repository foo.rb bar.rb foobar.rb foo.rb bar.rb foobar.rb
  • 24.
    git rm <file,dir> Recording Changes Removes the specified file(s) from staging area and current --cached do not remove the file from the working directory Working Directory Staging Area Repository foo.rb bar.rb foobar.rb foo.rb bar.rb foobar.rb
  • 25.
    git commit Recording Changes Savesthe changes made in the staging area to the repository Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
  • 26.
    git commit Recording Changes Savesthe changes made in the staging area to the repository Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
  • 27.
    git log History ofChanges Lists informations about commits in reverse chronological order commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number commit 085bb3bcb608e1e8451d4b2432f8ecbe6306e7e7 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 16:40:33 2008 -0700 removed unnecessary test commit a11bef06a3f659402fe7563abf99ad00de2209e6 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 10:31:28 2008 -0700 first commit
  • 28.
    git log History ofChanges Lists informations about commits in reverse chronological order commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number commit 085bb3bcb608e1e8451d4b2432f8ecbe6306e7e7 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 16:40:33 2008 -0700 removed unnecessary test commit a11bef06a3f659402fe7563abf99ad00de2209e6 Author: Scott Chacon <schacon@gee-mail.com> Date: Sat Mar 15 10:31:28 2008 -0700 first commit
  • 29.
    git log -p Historyof Changes Shows differences introduced by every commit commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number diff --git a/Rakefile b/Rakefile index a874b73..8f94139 100644 --- a/Rakefile +++ b/Rakefile @@ -5,7 +5,7 @@ require 'rake/gempackagetask' spec = Gem::Specification.new do |s| s.platform = Gem::Platform::RUBY s.name = "simplegit" - s.version = "0.1.0" + s.version = "0.1.1" s.author = "Scott Chacon" s.email = "schacon@gee-mail.com" s.summary = "A simple gem for using Git in Ruby code."
  • 30.
    git log -p Historyof Changes Shows differences introduced by every commit commit ca82a6dff817ec66f44342007202690a93763949 Author: Scott Chacon <schacon@gee-mail.com> Date: Mon Mar 17 21:52:11 2008 -0700 changed the version number diff --git a/Rakefile b/Rakefile index a874b73..8f94139 100644 --- a/Rakefile +++ b/Rakefile @@ -5,7 +5,7 @@ require 'rake/gempackagetask' spec = Gem::Specification.new do |s| s.platform = Gem::Platform::RUBY s.name = "simplegit" - s.version = "0.1.0" + s.version = "0.1.1" s.author = "Scott Chacon" s.email = "schacon@gee-mail.com" s.summary = "A simple gem for using Git in Ruby code." Where What
  • 31.
    git log OPTIONS Historyof Changes --stat shows list of modified files -1 -2 -n shows last commit shows last 2 commits shows last n commits -S<string> only shows commits adding/removing <string>
  • 32.
    git commit --amend Undo takeschanges in staging area and adds them to the previous commit Working Directory Staging Area Repository list of changes
  • 33.
    git commit --amend Undo takeschanges in staging area and adds them to the previous commit Working Directory Staging Area Repository list of changes
  • 34.
    git reset HEAD<file> Undo Removes the selected file from the staging area Working Directory Staging Area Repository puts “Hello World Everybody” - Words + Everybody
  • 35.
    git reset HEAD<file> Undo Removes the selected file from the staging area Working Directory Staging Area Repository puts “Hello World Everybody”
  • 36.
    git checkout --<file> Undo Discards changes of the file in the working directory Working Directory Staging Area Repository puts “Hello World Everybody”
  • 37.
    git checkout --<file> Undo Discards changes of the file in the working directory Working Directory Staging Area Repository puts “Hello World Everybody” puts “Hello World”
  • 38.
    git push <remote_name><branch_name> Going Remote Shares the modifications with the remote repository Local Working Directory Staging Area Repository My File changes to My File Remote master branch
  • 39.
    git push <remote_name><branch_name> Going Remote Shares the modifications with the remote repository Local Working Directory Staging Area Repository My File changes to My File Remote git push master branch
  • 40.
    git fetch <remote_name> GoingRemote Retrieves data from the remote repository (do not merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3
  • 41.
    git fetch <remote_name> GoingRemote Retrieves data from the remote repository (do not merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3 5 4
  • 42.
    git pull Going Remote Retrievesdata from the remote repository (and merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 3
  • 43.
    git pull Going Remote Retrievesdata from the remote repository (and merge) Local Working Directory Staging Area Repository My File changes to My File Remote 1 master 2 3 5 4 1 2 3 4 5 3
  • 44.
  • 45.
    branch: you divergefrom the main line of development and continue to do work without messing with that main line
  • 46.
  • 47.
  • 48.
    master mybranch $ git branchmybranch $ git checkout mybranch
  • 49.
    master mybranch $ git branchmybranch $ git checkout mybranch $ git commit
  • 50.
    master mybranch $ git branchmybranch $ git checkout mybranch $ git commit $ git commit
  • 51.
    master mybranch $ git branchmybranch $ git checkout mybranch $ git commit $ git commit $ git checkout master
  • 52.
  • 53.
  • 54.
  • 55.
    mybranch master $ git checkoutmaster $ git merge mybranch
  • 56.
  • 57.
  • 58.
  • 59.
    wants you tobranch&merge