About Git

Before Unix

• In 1965, Dennis Ritchie, Ken Thompson, and others developed UNIX in PDP-7-based assembly language at AT&T Bell Laboratory.
• C-based UNIX restructuring after Dennis Rich and Ken Thompson developed C in 1973.
• In 1984, Richard Stallman launched the GNU project to secure open software freedom.

Linux

• An operating system containing a kernel or GNU project library and tools created by Linus Torvalds.
• Applications in various fields such as PC, mobile, server, embedded system, etc.
• There are various distributions such as Redhat, Debian, Ubuntu, and Android.

What is Git?

• 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

Command

$ git ls -> list segment
	- git ls -l : detailed information
	- git ls -a : information about all files, including hidden files

$ git cd -> change directory

$ git mkdir -> make directory

$ git touch -> make file(only text-based file)

$ git pwd -> current location

$ git mv -> move

$ git re -> remove
	- git rm -r : delete the entire directory
	- git rm -rf : forced deletion

$ git vi -> The file you want to open

Vim

Mode
1. Normal mode : standard mode
2. Insert mode : press i on normal mode
3. visual mode : press v on normal mode
4. command mode : press : on normal mode

How to go back to normal mode : just press esc key

• Command(on normal mode)
  - h,j,k,l : arrow keys
  - o : open line(under)
  - 0 : open line(upper)
  - d : delete
  - dd : delete a line
  - y : yank(copy)
  - yy : yank a line
  - p : paste
  - a : append
  - u : undo
  - A : append from end of line
  - H : move to the top of the screen
  - L : move to the bottom of the screen