시스템프로그래밍 중간정리(lect3,4)

Vi & simple C

vi란 무엇인가....?

 

챗지피티 선생이 말씀하시길

vi는 리눅스와 유닉스 계열 운영체제에서 기본적으로 제공되는 텍스트 편집기(text editor)입니다.

 

세 가지 모드가 있습니다. (command mode, insert mode, status-line mode)

-    command mode:

       cusor moving: j(down), k(up), h(left), l(right)

       deletion: x(delete one character), dd(delete a line)

       copy and paste:

          3yy : copy 3 lines starting from the current line

          p   : paste them after the current line

       recover

          u   : recover what you have just deleted

 

-    command mode -> insertion mode : i, a, o

                               i: start insertion from the current cursor

                               a: start insertion after the current cursor

                               o: insert a new line

   

-     insertion mode -> command mode: ESC key

 

-    In status-line mode, we can store data,  go to certain line number,

     search string, etc.

-    command mode -> status-line mode: / or :

-    status-line mode:

          :q! : quit without saving

          :w : write

          :wq : save and exit

          /pat : search the pattern in "pat"

          :set number : display line numbers

          :40   : go to line 40

 

리눅스에서 C를 다뤄보자.

gcc : compile a  c program (gcc ex1.c 만 입력할 경우에는 a.out이라는 이름의 실행파일이 생성된다.)

       gcc -o ex1 ex1.c 

       : compile ex1.c and produce an object (executable) file“ex1”

       : -o ex1 means the executable file name is ex1

   g++ : compile a c++ program

       g++ -o ex1 ex1.cpp

 

   kill  : send a signal to a process

       kill 1234           : kill process whose pid is 1234

 

   ^c   : kill the current running process