Git - restore deleted but not committed files

You have deleted the file HelloWorld.java but not yet committed, if you want to restore it :

git checkout HEAD  HelloWorld.java

Git, undoing uncommitted changes

You have the staged file HelloWorld.java, you have modified it and staged those changes but then you want to unstage those changes :

git reset HEAD -- HelloWorld.java

You have a new file HelloWorld.java, you have added it to staged files but then you do not want to commit the new file:

git rm --cached  HelloWorld.java

if you want to undo all changes:

git checkout

Be careful,  git checkout removes all untracked changes and you can't recover those changes anymore (files never tracked by Git will be deleted).

My personal imaginary interview with The Clean Coder book :-P

Me : I must know my code works but how can I know my code works? 


Uncle Bob's book : That's easy. Test it. Test it again. Test it up. Test it down. Test it seven ways to Sunday!... and don't forget to automate your test.

Me: But isn't code hard to test, my code really is?

Uncle Bob's book: yes but only because that code has been designed to be hard to test.

Me: how can my code be designed to be easy to test? 

Uncle Bob's book: the best way is to write your tests first, before you write the code that passes them (TDD). 

A very minimal guide to the tar command

to extract from an archive

• for .tar use tar -xvf [archiveName] 
• for .tar.gz, .tgz  use tar -xvzf [archivefile]
• for .tar.bz2, .tbz2, .tbz  use tar -xvjf [archivefile]
• for .tar.Z than use tar -xvZf [archivefile}

to compress a folder or a list of files

• for .tar use tar -cvf [archiveName] [pathname ...]
• for .tar.gz, .tgz  use tar -cvzf [archiveName] [pathname ...]
• for .tar.bz2, .tbz2, .tbz  use tar -cvjf [archivename] [pathname ...]
• for .tar.Z use tar -cvZf [archivename] [pathname ...]

[pathname ...] can be the path of a folder or the path of a list of files you want to compress.

to see the content of an archive, without extracting:

• for .tar use tar -tvf [archiveName] 
• for .tar.gz, .tgz  use tar -tvzf [archivefile]
• for .tar.bz2, .tbz2, .tbz  use tar -tvjf [archivefile]
• for .tar.Z use tar -tvZf [archivefile}