Git Most useful commands

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Git is easy to learn and has a tiny footprint with lightning fast performance. It outclasses SCM tools like Subversion, CVS, Perforce, and ClearCase with features like cheap local branching, convenient staging areas, and multiple workflows.
If you are beginner or starting to import or exporting repository or creating new project in GIT, please follow the following commands , that may help , 

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Set your details

git config --global "John Doe"
git config --global ""
Use --global to set the configuration for all projects. If git config is used without --global and run inside a project directory, the settings are set for the specific project.

Make git ignore file modes

cd project/
git config core.filemode false
This option is useful if the file permissions are not important to us, for example when we are on Windows.

See your settings

git config --list

Initialize a git repository for existing code

cd existing-project/
git init

Clone a remote repository

git clone
This creates a new directory with the name of the repository.

Clone a remote repository in the current directory

git clone .

Get help for a specific git command

git help clone

Update and merge your current branch with a remote

cd repository/
git pull origin master
Where origin is the remote repository, and master the remote branch.
If you don't want to merge your changes, use git fetch

View remote urls

git remote -v

Change origin url

git remote set-url origin http//

Add remote

git remote add remote-name

See non-staged (non-added) changes to existing files

git diff
Note that this does not track new files.

See staged, non-commited changes

git diff --cached

See differences between local changes and master

git diff origin/master
Note that origin/master is one local branch, a shorthand for refs/remotes/origin/master, which is the full name of the remote-tracking branch.

See differences between two commits


See the files changed between two commits

git diff --name-only COMMIT1_ID COMMIT2_ID

See the files changed in a specific commit

git diff-tree --no-commit-id --name-only -r COMMIT_ID
git show --pretty="format:" --name-only COMMIT_ID

See diff before push

git diff --cached origin/master

See details (log message, text diff) of a commit

git show COMMIT_ID

Check the status of the working tree (current branch, changed files...)

git status

Make some changes, commit them

git add changed_file.txt
git add folder-with-changed-files/
git commit -m "Commiting changes"

Rename/move and remove files

git rm removeme.txt tmp/crap.txt
git mv file_oldname.txt file_newname.txt
git commit -m "deleting 2 files, renaming 1"

Change message of last commit

git commit --amend -m "New commit message"

Push local commits to remote branch

git push origin master

See recent commit history

git log

See commit history for the last two commits

git log -2

See commit history for the last two commits, with diff

git log -p -2

See commit history printed in single lines

git log --pretty=oneline

Revert one commit, push it

git revert dd61ab21
git push origin master

Revert to the moment before one commit

# reset the index to the desired tree
git reset 56e05fced

# move the branch pointer back to the previous HEAD
git reset --soft HEAD@{1}

git commit -m "Revert to 56e05fced"

# Update working copy to reflect the new commit
git reset --hard

Undo last commit, preserving local changes

git reset --soft HEAD~1

Undo last commit, without preserving local changes

git reset --hard HEAD~1

Undo last commit, preserving local changes in index

git reset --mixed HEAD~1
Or git reset HEAD~1
See also

Undo non-pushed commits

git reset origin/master

Reset to remote state

git fetch origin
git reset --hard origin/master

See local branches

git branch

See all branches

git branch -a

Make some changes, create a patch

git diff > patch-issue-1.patch

Add a file and create a patch

git add newfile
git diff --staged > patch-issue-2.patch

Add a file, make some changes, and create a patch

git add newfile
git diff HEAD > patch-issue-2.patch

Make a patch for a commit

git format-patch COMMIT_ID

Make patches for the last two commits

git format-patch HEAD~2

Make patches for all non-pushed commits

git format-patch origin/master

Create patches that contain binary content

git format-patch --binary --full-index origin/master

Apply a patch

git apply -v patch-name.patch

Apply a patch created using format-patch

git am patch1.patch

Create a tag

git tag 7.x-1.3

Push a tag

git push origin 7.x-1.3

Create a branch

git checkout master
git branch new-branch-name

Checkout a branch

git checkout new-branch-name

See commit history for just the current branch

git cherry -v master
(master is the branch you want to compare)

Merge branch commits

git checkout master
git merge branch-name
Here we are merging all commits of branch-name to master.

Merge a branch without committing

git merge branch-name --no-commit --no-ff

See differences between the current state and a branch

git diff branch-name

See differences in a file, between the current state and a branch

git diff branch-name path/to/file

Delete a branch

git branch -d new-branch-name

Push the new branch

git push origin new-branch-name

Get all branches

git fetch origin

Get the git root directory

git rev-parse --show-toplevel

Remove from repository all locally deleted files

git rm $(git ls-files --deleted)

Delete all untracked files

git clean -f
Including directories:
git clean -f -d
Preventing sudden cardiac arrest:
git clean -n -f -d

Show total file size difference between two commits

Short answer: Git does not do that.
Long answer: See

Unstage (undo add) files:

git reset HEAD file.txt

See closest tag

git describe --tags `git rev-list --tags --max-count=1`
Source. See also git-describe.

Have git pull running every X seconds, with GNU Screen

for((i=1;i<=10000;i+=1)); do sleep 30 && git pull; done
Use Ctrl+a Ctrl+d to detach the screen.

See previous git commands executed

history | grep git
grep '^git'  /root/.bash_history

See recently used branches (i.e. branches ordered by most recent commit)

git for-each-ref --sort=-committerdate refs/heads/ | head

Tar project files, excluding .git directory

cd ..
tar cJf project.tar.xz project/ --exclude-vcs

Tar all locally modified files

git diff --name-only | xargs tar -cf project.tar -T -

Look for conflicts in your current files

grep -H -r "<<<" *
grep -H -r ">>>" *
grep -H -r '^=======$' *
There's also git-grep.

Apply a patch not using git:

patch < file.patch

Source all the commands: