githubnotes

-> Git/Github ---> it is source code management tool which helps you to manage the application code. -> Git is local repository which is on you local machine. -> Github is centralised repository were you need to login using username/passwd.

-> git init -> which helps to convert normal directory to git directory.(which initilise the git congiguration).

-> Git clone -> were we can download entire repository from github to local git git clone (url -> github repo url) cd -> go inside directory vi filename -> to create new file (esc->shift:->wq) git add . -> . indicates all files git commit -m "message" -> (-m is message) git push origin branchname ->push code to github. git status -> to see the status before and after command exection for both add&commit.

 git pull origin branchname  ->pull code into local git

-> git branching ---> Branching will helps developers to work parallely or samintaniously with out any dependency on each other.

 git branch <bname> --> it will create branch 
 git checkout <bname>  -> switch from one to another branch

 git checkout -b <bname>  -> create and switch to that branch
 git branch -d <bname>    -> delete branch (-d delete)
 git branch    -> list the branches which are on local git
 git branch -a  -> it will list branches from both git and github. (-a   all branches)

-> git log --> commit history display git log --oneline shows commit history with less content

-> git diff -> it will show diff b/w two branches git diff -> it will show diff b/w two commit id's git show -> to see details info for commit id

-> git merge --> combine two diff branches into single branch. --> github->pullrequest->create pullrequest->merge request git checkout main git merge

-> git stash --> to store current working directory temporarly git stash -> save the current work dir to stash git stash list -> show the list of saved items git stash apply -> to get back the save curent dir git stash drop -> delete the saved items from stash

-> .gitignore --> .gitignore file will helps to skip/avoid the unwanted files while pushing into github. vi .girignore --> *.log

-> git reset --> to undo the changes/// -> move from current state to previous state.

git reset

-> Setup git in Linux VM sudo yum install git -y ssh-keygen -> enter -> enter-> enter to get key -> cat /home/ec2-user/.ssh/id_rsa.pub copy the key to github account in settings -> SSH option git clone -> yes -> enter ---> it will start clone.

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Maven Tool: -> Maven is build automation tool -> using maven we are goint to build the application code written by developers -> After build it will generate target folder and .jar file inside init (target/***.jar) -> maven is having lifecycle which contains diff stages/phases -> generate resource - Generate required de[pendencies to build application code using maven. -> Compile code -- convert code into binary language (machine readable) -> Unit test --- Maven will test internally diff test cases -> Package ---- Creating .jar file from the code (copying all the required code into jar) -> install ----- Install the .jar on maven server -> Deploy ----- Deploy is ntg but upload/deploy the dependencies and .jar files to maven repository. -> Clean ----- Claen the existing .jar file and recreate new .jar file. -> When we download and install maven -> .M2 folder ---- were it containes entire configuration of maven. settings.xml ---- Maven repo URL then username/password. pom.xml ---- when we execute maven commnd will simply follow the pom.xml file -> Using single command we can execute the entire maven lifecycle mvn clean install -> Download and install maven in windows/Linux Windows: -> https://phoenixnap.com/kb/install-maven-windows (Installation steps) -> https://maven.apache.org/download.cgi (download maven package) Linux: -> Sudo yum install maven -y -> maven -version

-> Make sure execute maven command were the POM file is. Sample Repo: https://github.com/Renukadema/Calculator.git

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