Rhcsa Road

Homework the next day

Job requirements

1. Introduce the difference between soft and hard links

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. In the current system / Create under directory 100 File （ File name e.g ：abc1..abc100）

4. stay newfifile Write the following in the document

He love his lover

He love his liker

He like his lover

He like his liker

5. Introduce ll List what each column of information in a directory is

6. Create directory /test/sysroot Create three files in this directory a,b,c After then sysroot Directory move to /tmp Change the name to sys Ensure that the three files in the directory also exist

7. Delete /tmp/sys/a file .

8. Catalog /tmp Create 4 A catalog , And create one under each of these four directories test Catalog

9. Create a test Catalog , Create a file in this directory , Content writing nano

10. stay /dir Create directory under dir2 And documents file1, Moving files file1 To create test Directory , Put the table of contents dir2 Copied to the test Directory

Homework results

1

Soft link ：

Symbolic links are also called soft links , And the original file is not a file . for example Windows Shortcut to ,

Characteristics of action ： Find a file in the specified path and access it quickly and easily , Delete source file shortcut cannot be accessed

Hard links ：

Multiple filenames point to the same Inode

Characteristics of action ： Prevent users from deleting by mistake , Backup （ Backup only for file names ）, Deleting the source file will not affect the hard link

2

establish aaa

[[email protected] ~]# cd /home
[[email protected] home]# touch aaa
[[email protected] home]# ll
total 4
-rw-r--r--.  1 root   root      0 Feb 11 06:45 aaa
drwx------. 15 redhat redhat 4096 Feb 10 06:50 redhat

establish a.txt

[[email protected] ~]# cd /
[[email protected] /]# ln -s / a.txt
[[email protected] /]# ll
total 28
lrwxrwxrwx.   1 root root    1 Feb 11 06:59 a.txt -> /

establish A

[[email protected] /]# cd /root
[[email protected] ~]# touch A
[[email protected] ~]# link A A.txt
[[email protected] ~]# ll
total 8
-rw-r--r--. 2 root root    0 Feb 11 07:00 A

3

[[email protected] ~]# cd
[[email protected] ~]# pwd
/root
[[email protected] ~]# touch abc{1..100}
[[email protected] ~]# ll
total 8
-rw-r--r--. 2 root root    0 Feb 11 07:00 A
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc1
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc10
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc100
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc11
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc12
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc13
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc14
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc15
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc16
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc17
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc18
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc19
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc2
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc20
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc21
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc22
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc23
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc24
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc25
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc26
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc27
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc28
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc29
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc3
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc30
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc31
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc32
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc33
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc34
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc35
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc36
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc37
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc38
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc39
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc4
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc40
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc41
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc42
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc43
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc44
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc45
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc46
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc47
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc48
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc49
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc5
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc50
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc51
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc52
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc53
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc54
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc55
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc56
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc57
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc58
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc59
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc6
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc60
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc61
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc62
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc63
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc64
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc65
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc66
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc67
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc68
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc69
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc7
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc70
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc71
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc72
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc73
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc74
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc75
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc76
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc77
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc78
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc79
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc8
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc80
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc81
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc82
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc83
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc84
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc85
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc86
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc87
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc88
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc89
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc9
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc90
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc91
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc92
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc93
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc94
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc95
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc96
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc97
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc98
-rw-r--r--. 1 root root    0 Feb 11 07:02 abc99
-rw-------. 1 root root 1036 Feb 10 14:33 anaconda-ks.cfg
-rw-r--r--. 2 root root    0 Feb 11 07:00 A.txt
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Desktop
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Documents
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Downloads
-rw-r--r--. 1 root root 1308 Feb 10 14:39 initial-setup-ks.cfg
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Music
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Pictures
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Public
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Templates
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Videos

4

[[email protected] ~]# touch n.txt
[[email protected] ~]# nano n.txt
[[email protected] ~]# cat n.txt
 He love his lover
 He love his liker
 He like his lover
 He like his liker

5

The first column is the file type

6

[[email protected] ~]# mkdir /test/sysroot -p
[[email protected] ~]# ll
total 8
-rw-------. 1 root root 1036 Feb 10 14:33 anaconda-ks.cfg
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Desktop
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Documents
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Downloads
-rw-r--r--. 1 root root 1308 Feb 10 14:39 initial-setup-ks.cfg
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Music
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Pictures
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Public
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Templates
drwxr-xr-x. 2 root root    6 Feb 10 07:42 Videos
[[email protected] ~]# mkdir /tmp -p
[[email protected] ~]# cd /test/sysroot
[[email protected] sysroot]# ll
total 0
[[email protected] sysroot]# touch a b c
[[email protected] sysroot]# ll
total 0
-rw-r--r--. 1 root root 0 Feb 12 21:16 a
-rw-r--r--. 1 root root 0 Feb 12 21:16 b
-rw-r--r--. 1 root root 0 Feb 12 21:16 c
[[email protected] sysroot]# cd
[[email protected] ~]# mv /test/sysroot /tmp/sys
[[email protected] ~]# ll /tmp
total 20
drwxr-xr-x. 2 root   root     33 Feb 12 21:16 sys
[[email protected] ~]# ll /tmp/sys
total 0
-rw-r--r--. 1 root root 0 Feb 12 21:16 a
-rw-r--r--. 1 root root 0 Feb 12 21:16 b
-rw-r--r--. 1 root root 0 Feb 12 21:16 c

7

[[email protected] ~]# cd /tmp/sys
[[email protected] sys]# rm a
rm: remove regular empty file 'a'? y
[[email protected] sys]# ll
total 0
-rw-r--r--. 1 root root 0 Feb 12 21:16 b
-rw-r--r--. 1 root root 0 Feb 12 21:16 c

8

[[email protected] tmp]# mkdir /tmp/b/test -p
[[email protected] tmp]# mkdir /tmp/b/test -p
[[email protected] tmp]# mkdir /tmp/c/test -p
[[email protected] tmp]# mkdir /tmp/d/test -p
[[email protected] tmp]# ll
total 20
drwxr-xr-x. 3 root   root     18 Feb 12 21:24 a
drwxr-xr-x. 3 root   root     18 Feb 12 21:24 b
drwxr-xr-x. 3 root   root     18 Feb 12 21:24 c
drwxr-xr-x. 3 root   root     18 Feb 12 21:24 d

9

[[email protected] ~]# mkdir -p /test
[[email protected] ~]# cd /test
[[email protected] test]# touch a.txt
[[email protected] test]# nano a.txt
[[email protected] test]# cat a.txt
nano

10

[[email protected] ~]# mkdir -p /dir
[[email protected] ~]# cd /dir
[[email protected] dir]# mkdir -p /dir2
[[email protected] dir]# touch file1
[[email protected] dir]# ll
total 0
-rw-r--r--. 1 root root 0 Feb 12 21:29 file1
[[email protected] dir]# cd
[[email protected] ~]# mkdir -p /dir/dir2
[[email protected] ~]# cd /dir
[[email protected] dir]# ll
total 0
drwxr-xr-x. 2 root root 6 Feb 12 21:29 dir2
-rw-r--r--. 1 root root 0 Feb 12 21:29 file1
[[email protected] dir]# cp -p file1 /test
[[email protected] dir]# cd /test
[[email protected] test]# ll
total 4
-rw-r--r--. 1 root root 5 Feb 12 21:27 a.txt
-rw-r--r--. 1 root root 0 Feb 12 21:29 file1
[[email protected] test]# cd /dir
[[email protected] dir]# cp -r dir2 /test
[[email protected] dir]# cd /test
[[email protected] test]# ll
total 4
-rw-r--r--. 1 root root 5 Feb 12 21:27 a.txt
drwxr-xr-x. 2 root root 6 Feb 12 21:31 dir2
-rw-r--r--. 1 root root 0 Feb 12 21:29 file1