Linux Permissions command

Tag: User password indicates dir groupadd lock useradd Ash bash the

1 The new user natasha,uid is 1000,gid to 555 and the note information is "master"
　　Groupadd-g 555 Natasha
Useradd-u 1000-g 555-c "Master" Natasha

2. Modify the Natasha user's home directory to/natasha'
usermod-d Home/natasha Natasha
3 . View the last line of the user information profile
　　Tail-1/etc/passwd
Natasha:x:1000:555:master:/home/natasha:/bin/bash

 4 . Set password for Natasha user "123  " 
 echo "123" | passwd--stdin Natasha 
  5  . View the last line of the user password profile 
  tail-1/etc/shadow 
   natasha:$6$til8kmxz$ Fpfzb7egbvsmm4o7ea8o2hobr6gy9kown5xhruge4o2n2kwbe5c8g/kunhhr5kyh7j5.6bn9zfwuchzehsiw8/:17240:0:99999:7::: 

6 . Lock the Natasha user account
USERMOD-L Natasha
7 . Unlock the Natasha user account
Usermod-u Natasha
8 . New group Police,gid to 1111
Groupadd-g 1111 Police
9 . View the last line of the group configuration file
　　Tail-1/etc/group
police:x:1111:

Ten . Add Natasha users to the police group
Usermod-g Police Natasha

 One . Modify the group name of the police group to Jingcha
　　Groupadd Jingcha
Groupmod-n JINGCH Police

 12   Userdel-r Natasha 
  13   delete jingcha Group 
 Groupdel Jingcha 
  14   mkdir Test && touch test/file1 
  15   ls-l test/file1 
  16  . Set permissions for file File1 so that other users can write to the file. 
 chmod o=w test/file1 
  17    ls-l test/file1 
   rw-r---w. 1 root root 0 March   16:22 tes T/file1  

 - Remove the Read permission for the file file1 from the same group of users and view the settings results.
chmod g-r Test/file1
 + .  Set permissions for file files in numeric notation, all readable, writable, and executable, and the owning group user and other users have only read and execute permissions. Review the setup results when the settings are complete.
　　chmod 755 File1
Ls-l file1
-rwxr-xr-x. 1 root root 0 March 16:22 file1

 - Change the permissions of the file file1 in numeric form so that the owner can only read the file. No other user has permission. View the settings results.
chmod file1
 + . Go back to the upper directory to see the permissions for test
　　Ls-ld test/
Drwxr-xr-x. 2 root root 19 March 16:22 test/

 22   chmod o=x test/
  23     Tail-1/etc/passwd 
  alex:x:1010:1010::/home/alex:/bin/bash 
 tail-1/etc/shadow 
 alex:!! : 17240:0:99999:7::: 
  Tail-1/etc/group 
  alex:x:1010: 
 tail-1/etc/gshadow 
 Alex: !:: 
 Mkdir/home/alex 
 Cp-r/etc/skel/.[!.] */home/alex/
 Chown-r alex.alex/home/alex/
 Touch/var/spool/mail/alex 
 Chown-r alex.mail/var/spool/mail/ Alex 

New Directory/test/dir, the owner is Tom, the array for the group1,/Test directory has permission of 777
　　Mkdir-p/test/dir
Useradd Tom
Groupadd group1
Chown Tom.group1/test/dir
chmod 777/test/

 - New user jack, switch to the jack user, verify the jack User's rwx permission to the dir directory (open another terminal, and then modify the Dir directory's others permissions)
　　

 - . Add Jack to the group1 group to verify the Jack User's rwx permissions to the dir directory (open another terminal, and then modify the group permissions of the Dir directory)
　　

 - . Switch to Tom User, verify that Tom user rwx permissions to dir directory (open another terminal, and then modify the user permissions of the dir directory)

　　in the dir directory, create a new file Tom.txt, the owner is Tom, the group isthe group1,/test directory permissions of 777
 in new user rose, switch to Rose User, verify the Rose User's rwx permissions to Tom.txt (open another terminal, modify tom.txt others permissions to match the verification process)
 - Add rose to the group1 group and, under the Rose user, verify the rwx permissions of the rose user to Tom.txt (open another terminal, then modify Tom.txt group1 permissions to match the verification process)
Switch to Tom User, verify Tom User's rwx permission to Tom.txt (open another terminal, modify Tom.txt user permissions to match the verification process)

Linux Permissions command