Basic Git Commands

• Prerequisites
  Configure your email address and username to be used by Git. The flag —global means apply the configuration to all of your Git repositories on the computer. The flag —local means apply the confoguration to only the current Git repository.
  $gitconfig[--local|--global]user.email"userid@domain.tld"$ git config [—local | —global] user.name “username”

• View git config details
  $ git config —list

• Create a local push repository
  $gitinit--bare<pus{h}_{r}epositor{y}_{n}ame>.git$ git clone /D/LOCALGIT/<push_repository_name>

• Add a local push repository as remote to a local project
  $gitinit$ git remote add origin D:/LAB/LOCALGIT/project.git
  $ git fetch

• Create a local repository
  $mkdirProjects$ mkdir Projects/DataScientistsToolbox
  $mkdirProjects/DataScientistsToolbox/sample$ cd Projects/DataScientistsToolbox/sample
  $gitinitInitialisedemptyGitrepositoryin/home/osboxes/Projects/DataScientistsToolbox/sample/.git/$ ls -la
  drwxrwxr-x 3 osboxes osboxes 4096 Apr 5 19:15 .
  drwxrwxr-x 3 osboxes osboxes 4096 Apr 5 19:07 ..
  drwxrwxr-x 7 osboxes osboxes 4096 Apr 5 19:15 .git

• Create an empty README.md file in the local repository.
  $touchREADME.md$ git add .
  $gitcommit-m"initialcommit"\ast \ast [master(root-commit)b7c48f3]initialcommit1filechanged,0insertions(+),0deletions(-)createmode100644README.md\ast \ast$ git status
  On branch master
  nothing to commit, working directory clean
  $ git show
  commit b7c48f3e5cdc772e6a198c3633acd853a69a5778
  Author: jhudss
  Date: Sun Apr 5 19:21:21 2015 -0300
  initial commit
  diff —git a/README.md b/README.md
  new file mode 100644
  index 0000000..e69de29

• Edit the README.md file and type any text in markdown format into the file.
  $nanoREADME.md$ git add -A .
  $ git commit -m “added content”
  [master 8fd8eb8] added content
  1 file changed, 41 insertions(+)

• Edit the README.md file swapping “Getting and Cleaning Data” and “Exploratory Data Analysis.”
  $nanoREADME.md$ git commit -m “swapped order of two courses”
  [master 87d0125] swapped order of two courses
  1 file changed, 1 insertion(+), 1 deletion(-)

• Determine whether there are any changes.
  $gitstatus\ast \ast Onbranchmasternothingtocommit,workingdirectoryclean\ast \ast$ git show
  commit 87d012594aa5a8a39e99d4728dc8c853779587ab
  Author: jhudss
  Date: Sun Apr 5 19:34:34 2015 -0300
  swapped order of two courses
  diff —git a/README.md b/README.md
  index 756292a..48587e6 100644
  ---a/README.md
  +++b/README.md
  @@ -25,8 +25,8 @@ The courses comprising the Data Science Specialization are:
  *Data Scientist’s Toolbox
  *R Programming-
  *Exploratory Data Analysis
  *Getting and Cleaning Data+
  *Exploratory Data Analysis
  *Reproducible Research
  *Statistical Inference
  *Regression Models

• Create a branch named ‘draft’.
  $gitcheckout-bdraft\ast \ast Switchedtoanewbranc{h}^{\prime }draf{t}^{\prime }\ast \ast$ git status
  On branch draft
  nothing to commit, working directory clean

• Edit the README.md file to add “Git is easy. Git is fun. Thanks Linus!” anywhere in the file.
  $nanoREADME.md$ git status
  On branch draft
  Changes not staged for commit:
  (use “git add …” to update what will be committed)
  (use “git checkout — …” to discard changes in working directory)
  modified: README.md
  no changes added to commit (use “git add” and/or “git commit -a”)
  $ git commit -a -m “thanked the creator of Git”
  [draft 34af00f] thanked the creator of Git
  1 file changed, 2 insertions(+)

• Switch to the ‘master’ branch and check the repository status.
  $gitcheckoutmaster\ast \ast Switchedtobranc{h}^{\prime }maste{r}^{\prime }\ast \ast$ git status
  On branch master
  nothing to commit, working directory clean

• Switch to a git tag
  git checkout tags/v3.2.1

• Merge the ‘draft’ branch’ with the ‘master’ branch and check the repository status.
  $gitmergedraft\ast \ast Updating87d\mathrm{0125..34}af00fFast-forwardREADME.md|2++1filechanged,2insertions(+)\ast \ast$ git status
  On branch master
  nothing to commit, working directory clean
  $ git show
  commit 34af00fc564fd28e485503715dd5a9a9a461329a
  Author: jhudss
  Date: Sun Apr 5 19:49:08 2015 -0300
  thanked the creator of Git
  diff —git a/README.md b/README.md
  —index 48587e6..aa53fee 100644
  --- a/README.md
  +++ b/README.md
  @@ -19,6 +19,8 @@ is to provide the learner with:

1. an appreciation of the mathematics & statistics involved indata science.
   +Git is easy. Git is fun. Thanks Linus!

References

• Git
• The Data Scientist’s Toolbox