[untitled] rhcsa first operation

1. Introduce the difference between soft and hard links

Soft link ： Soft links and windows The desktop shortcut of the system is the same .

Hard links ： Hard links are like windows The copied copy of the file is the same , But the name is different .

2. Create hard and soft link files as required ​ stay /home Create the file as aaa, And in / Create a soft link file in the directory a.txt; /root Create a hard link file as a

3. Introduce ll List what each column of characters in a directory represents

① file type . The first character means ：“-” text file ;“d” Directory file ;“l” Link to the file ;“b” Block device file ;“c” Character device file ;“p” Pipeline files ;“s” Socket file .（ common 7 Kind of ）

② Number of hard links .

③ Users .

④ Subordinate to the group .

⑤ file size .

⑥ establish 、 Time of revision .

4.linux file type （ common 7 Kind of ）

“-” text file ;

“d” Directory file ;

“l” Link to the file ;

“b” Block device file ;

“c” Character device file ;

“p” Pipeline files ;

“s” Socket file .