Difference between revisions of "Git"

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==Examples==
 
==Examples==
 
===Basic===
 
===Basic===
*Quick help
+
* Quick help:
  git help      # returns most common commands
+
  $ git help      # returns most common commands
  git help -a  # get a list of all installed git commands
+
  $ git help -a  # get a list of all installed git commands
  man git-add  # man page on the 'add' command
+
  $ man git-add  # man page on the 'add' command
*Start a new git repository:
+
 
  mkdir my_new_project && cd my_new_project
+
* Start a new git repository:
  git init
+
  $ mkdir my_new_project && cd my_new_project
 +
  $ git init
 
  # create some new files, then:
 
  # create some new files, then:
  git add .
+
  $ git add .
  git commit
+
  $ git commit
*See what has changed since last commit:
+
#~OR~
  git diff
+
$ git commit -am 'initial commit message'
*A more concise way to view what has changed and what needs to be done
+
 
  git status
+
* See what has changed since last commit:
 +
  $ git diff
 +
 
 +
* A more concise way to view what has changed and what needs to be done:
 +
  $ git status
 +
 
 +
* Clone a specific remote branch:
 +
$ git clone --single-branch --branch <branchname> <remote-repo>
 +
 
 +
===Miscellaneous===
 +
 
 +
* View current git user:
 +
$ git config user.email
 +
 
 +
* Change to a different git user:
 +
$ git config --global user.email "someone@somewhere.com"
 +
 
 +
* Check <code>git log</code> for a specific function in a specific (e.g., Python) file:
 +
<pre>
 +
# Syntax:
 +
$ git log -L :<funcname>:<file>
 +
 
 +
# Example:
 +
$ git log -L :load_json:compare_rke_state_files.py
 +
commit b5ac4b65f9554a32fbec64435171c07a20a52de8
 +
Author: Christoph Champ <someone@somewhere.com>
 +
Date:  Sat Jun 15 18:47:12 2019 -0700
 +
    initial commit of compare_rke_state_files.py
 +
diff --git a/ansible/compare_rke_state_files.py b/ansible/compare_rke_state_files.py
 +
--- /dev/null
 +
+++ b/ansible/compare_rke_state_files.py
 +
@@ -0,0 +8,6 @@
 +
+def load_json(filename):
 +
+    with open(filename) as json_file:
 +
+        data = json.load(json_file)
 +
+    return data
 +
</pre>
  
 
===git-svn===
 
===git-svn===
The following three commands will import a remote [[svn]] repository into a local git repository.
+
* The following three commands will import a remote [[svn]] repository into a local git repository:
  mkdir pymmlib && cd pymmlib
+
  $ mkdir pymmlib && cd pymmlib
  git svn init -t tags -b branches -T trunk <nowiki>https://pymmlib.svn.sourceforge.net/svnroot/pymmlib</nowiki>
+
  $ git svn init -t tags -b branches -T trunk <nowiki>https://pymmlib.svn.sourceforge.net/svnroot/pymmlib</nowiki>
  git svn fetch
+
  $ git svn fetch
 +
 
 +
==Gitconfig==
 +
 
 +
* Example:
 +
<pre>
 +
$ cat ~/.gitconfig
 +
[user]
 +
    name = Christoph Champ
 +
    email = someone@somewhere.com
 +
[push]
 +
    default = simple
 +
[alias]
 +
    lg1 = log --graph --abbrev-commit --decorate --date=relative --format=format:'%C(bold blue)%h%C(reset) - %C(bold green)(%ar)%C(reset) %C(white)%s%C(reset) %C(dim white)- %an%C(reset)%C(bold yellow)%d%C(reset)' --all
 +
    lg2 = log --graph --abbrev-commit --decorate --format=format:'%C(bold blue)%h%C(reset) - %C(bold cyan)%aD%C(reset) %C(bold green)(%ar)%C(reset)%C(bold yellow)%d%C(reset)%n''          %C(white)%s%C(reset) %C(dim white)- %an%C(reset)' --all
 +
    lg3 = log --graph --abbrev-commit --decorate --all \
 +
          --format=format:'%C(bold blue)%h%C(reset) - %C(bold cyan)%aD%C(dim white) - %an%C(reset) %C(bold green)(%ar)%C(reset)%C(bold yellow)%d%C(reset)%n %C(white)%s%C(reset)'
 +
    lg = !"git lg1"
 +
[url "git@github.com:"]
 +
    insteadOf = https://github.com/
 +
</pre>
  
 
==See also==
 
==See also==
 
*[[svn]]
 
*[[svn]]
*[http://www.mcnabbs.org/andrew/smug/ Smug] &mdash; a wiki built with git as the backend (also using [[Python]] and [http://djangoproject.com/ Djanjo])
 
  
 
==External links==
 
==External links==
*[http://git.or.cz/ Git homepage], maintained by [[Junio Hamano]]
+
*[http://git-scm.com/ Official website]
 
*[http://www.kernel.org/pub/software/scm/git/docs/user-manual.html Git User's Manual], also distributed with Git in Documentation/user-manual.txt
 
*[http://www.kernel.org/pub/software/scm/git/docs/user-manual.html Git User's Manual], also distributed with Git in Documentation/user-manual.txt
*[http://www.kernel.org/git/ Git] - the project page at kernel.org
+
*[http://maryrosecook.com/blog/post/git-in-six-hundred-words Git in six hundred words]
 +
*[http://maryrosecook.com/blog/post/git-from-the-inside-out Git from the inside out]
 +
*[http://www.gelato.unsw.edu.au/archives/git/0512/13748.html git for the confused] &mdash; extremely in-depth manual/tutorial
 +
*[https://git.kernel.org/cgit/ Kernel.org git repositories]
 
*[http://linux.yyz.us/git-howto.html Kernel Hackers' Guide to git]
 
*[http://linux.yyz.us/git-howto.html Kernel Hackers' Guide to git]
 
*[http://www.linux-mips.org/wiki/Git Git] and [http://www.linux-mips.org/wiki/WhatIsGit WhatIsGit] at [http://www.linux-mips.org LinuxMIPS] wiki
 
*[http://www.linux-mips.org/wiki/Git Git] and [http://www.linux-mips.org/wiki/WhatIsGit WhatIsGit] at [http://www.linux-mips.org LinuxMIPS] wiki
*[http://git.or.cz/course/svn.html Git - SVN Crash Course]
+
*"[http://2ndscale.com/rtomayko/2008/the-thing-about-git The Thing About Git]"
*[http://utsl.gen.nz/talks/git-svn/intro.html An introduction to git-svn for Subversion/SVK users and deserters], article by Sam Vilain
+
*"[http://mikegerwitz.com/papers/git-horror-story A Git Horror Story: Repository Integrity With Signed Commits]", by Mike Gerwitz
*[http://eigenclass.org/hiki/gibak-backup-system-introduction A better backup system based on Git]
+
*[http://tomayko.com/writings/the-thing-about-git The Thing About Git]
+
*[[wikipedia:Git (software)]]
+
  
 
[[Category:Linux Command Line Tools]]
 
[[Category:Linux Command Line Tools]]
 +
[[Category:DevOps]]

Latest revision as of 00:38, 19 February 2021

Git is a distributed revision control / software configuration management project created by Linus Torvalds, initially for the Linux kernel development.

Git is by far my favourite revision control system. I not only use it for software management, I also use it as my backup system for any of my text files.

Examples

Basic

  • Quick help:
$ git help      # returns most common commands
$ git help -a   # get a list of all installed git commands
$ man git-add   # man page on the 'add' command
  • Start a new git repository:
$ mkdir my_new_project && cd my_new_project
$ git init
# create some new files, then:
$ git add .
$ git commit
#~OR~
$ git commit -am 'initial commit message'
  • See what has changed since last commit:
$ git diff
  • A more concise way to view what has changed and what needs to be done:
$ git status
  • Clone a specific remote branch:
$ git clone --single-branch --branch <branchname> <remote-repo>

Miscellaneous

  • View current git user:
$ git config user.email
  • Change to a different git user:
$ git config --global user.email "someone@somewhere.com"
  • Check git log for a specific function in a specific (e.g., Python) file:
# Syntax:
$ git log -L :<funcname>:<file>

# Example:
$ git log -L :load_json:compare_rke_state_files.py
commit b5ac4b65f9554a32fbec64435171c07a20a52de8
Author: Christoph Champ <someone@somewhere.com>
Date:   Sat Jun 15 18:47:12 2019 -0700
    initial commit of compare_rke_state_files.py
diff --git a/ansible/compare_rke_state_files.py b/ansible/compare_rke_state_files.py
--- /dev/null
+++ b/ansible/compare_rke_state_files.py
@@ -0,0 +8,6 @@
+def load_json(filename):
+    with open(filename) as json_file:
+        data = json.load(json_file)
+    return data

git-svn

  • The following three commands will import a remote svn repository into a local git repository:
$ mkdir pymmlib && cd pymmlib
$ git svn init -t tags -b branches -T trunk https://pymmlib.svn.sourceforge.net/svnroot/pymmlib
$ git svn fetch

Gitconfig

  • Example:
$ cat ~/.gitconfig
[user]
    name = Christoph Champ
    email = someone@somewhere.com
[push]
    default = simple
[alias]
    lg1 = log --graph --abbrev-commit --decorate --date=relative --format=format:'%C(bold blue)%h%C(reset) - %C(bold green)(%ar)%C(reset) %C(white)%s%C(reset) %C(dim white)- %an%C(reset)%C(bold yellow)%d%C(reset)' --all
    lg2 = log --graph --abbrev-commit --decorate --format=format:'%C(bold blue)%h%C(reset) - %C(bold cyan)%aD%C(reset) %C(bold green)(%ar)%C(reset)%C(bold yellow)%d%C(reset)%n''          %C(white)%s%C(reset) %C(dim white)- %an%C(reset)' --all
    lg3 = log --graph --abbrev-commit --decorate --all \
          --format=format:'%C(bold blue)%h%C(reset) - %C(bold cyan)%aD%C(dim white) - %an%C(reset) %C(bold green)(%ar)%C(reset)%C(bold yellow)%d%C(reset)%n %C(white)%s%C(reset)'
    lg = !"git lg1"
[url "git@github.com:"]
    insteadOf = https://github.com/

See also

External links