Little white Python Road Linux section 10/28&29

RWX permissions of other people in the main group on files

1.userdel Delete things are not complete, there will be residues,

completely delete [[email protected] ~]# Userdel-r Tom
single delete [[email protected] ~]# Rm-rf/var/spool/mail/tom
The corresponding numeric value r=4 w=2 x=1, then rwx=7

#1 Create a directory,[[Email protected] ~]#cd/tmp/View permissions [[email protected] tmp]#ll-d/tmp/DRWXRWXRWT. 8192 root root October 13:41/tmp/create file [[email protected] tmp]#mkdir/testView permissions [[email protected] tmp]#ll-dl/testdrwxrwxrwx 4 root root 43 October 29 12:37/Test[[email protected] tmp]#cd/test[[email protected] test]#Touch A.txt[[email protected] test]#ll A.txt-rw-r--r--1 root root 0 October 29 13:47A.txt Create a regular user [[email protected] test]#useradd Tom[[email protected] test]#Su-tomLast Login: Day October 13:18:49 CST 2017pts/0 on [[email protected]~]$ CD/Test View file [[email protected] test]$ lsa.txt test1 Tom#4[email protected] test]$ cat A.txt#(no content)#6[ email protected] test]$ cat a.txt (readable) [[email protected] test]$ echo'Tom'>>a.txt (writable)#8[email protected] test]$ cat a.txt-bash:./a.txt: Insufficient Authority# One[[email protected] test]$./a.txt (executable)

#2 super users[email protected] ~]$ Su-root password: Last login: Day October13:00:00 CST 2017PTS/1on [[email protected]~]#echo ' root11111 ' > A.txt[[Email protected] ~]#chmod o=-A.txt (Other people have permission of 0)[[Email protected] ~]#ll A.txt-RWXR-----1 root root 10 October 29 13:49a.txt#5.[[Email protected] ~]#chmod o=r a.txt#7[[Email protected] ~]#chmod o=w a.txt#9[[Email protected] ~]#Cat A.txtroot11111#Ten[[Email protected] ~]#chmod o=rx a.txt# A[[Email protected] ~]#vim a.txt (added LS passwd)[[Email protected] ~]#./a.txtAnaconda-ks.cfg a.txt initial-setup-ks.cfg jack.txt Change the password of the user root. New Password: invalid password: Password not provided re-enter new password: Password not provided passwd: Authentication token operation error [[email protected]~]#[[Email protected] ~]# 

Usermod-g Target group name User name----------Add this user to the target group

Permission can be added minus eg:chmod u-r a.txt

U-g-O

R U-r G-r

X

W

rwx permissions of the genus Master Group on the directory

#1 Creating a user[[Email protected] ~]#useradd Alex#3Exit[[email protected]~]#Su-alex[[email protected] Alex]#ls/test/test1/jack1.txt jack2.txt#5[[email protected] Alex]#cd/test/test1/[[email protected] test1]#Cd/test/test1[[email protected] test1]#pwd/test/test17[[email protected] test1]#lsjack1.txt jack2.txt9[[email protected] test1]#Exitlog out [[email protected] test]$ su-Alex[[email protected] test]$ CD/test/test111[email protected] test]$ RM-rf/test/test1/Jack1.txt13[[email protected] test]$ ls/test/test1jack1.txt jack2.txt[[email protected] test]$ touch/test/test/Tom.txt15[[email protected] test1] $CD/test/Test1[[email protected] test1]$ Ls[[email protected] test1]$ touch/test/test117[[email protected] test1]$ Exit[[email protected] test]#Cd/test/test1[[email protected] test1]#Touch/test/test1[[email protected] test1]#lsjack1.txt Jack2.txt[[email protected] test1]#RM-RF jack2.txt[[email protected] test1]#ll A.txt

2[[Email protected]~]$ mkdir/test/Test1[[email protected]~]$ touch/test/test1/Jack1.txt[[email protected]~]$ touch/test/test1/Jack2.txt[[email protected]~]$ Exit[[email protected]~]#ll-d/text/text1/[[Email protected] ~]#chmod o-x/test/test1/4[[email protected] ~]#chmod o-x/test/test1/6[[email protected] ~]#chmod o=rx/test/test1/8[[email protected] ~]#chmod o=r/test/test1/10[[Email protected]~]#Cd/test/test1[[email protected] test1]#ll[[email protected] test1]#chmod 777 *[[email protected] test1]#llTotal dosage 0-RWXRWXRWX 1 Jack Jack 0 October 29 14:39Jack1.txt-RWXRWXRWX 1 Jack Jack 0 October 29 14:39Jack2.txt[[email protected] test1]#ll-d/test/test1/bash:ll-d: no command found ... [[email protected] test1]#llTotal dosage 0-RWXRWXRWX 1 Jack Jack 0 October 29 14:39Jack1.txt-RWXRWXRWX 1 Jack Jack 0 October 29 14:39Jack2.txt[[email protected] test1]#ll-d/test/test1drwxrwxr--2 Jack Jack 40 October 14:39/test/Test1[[email protected] test1]#chmod o+x/test/test112[[email protected] test1]#lsjack1.txt jack2.txt14[[email protected] test1]#lsjack1.txt Jack2.txt[[email protected] test1]#Ll.tom.txt[[email protected] test1]#[[email protected] test1]#ll-d/test/test1Drwxrwxr-x 2 Jack Jack 23 October 15:08/test/Test1[[email protected] test1]#chmod o=-/test/test1[[email protected] test1]#ll-d/test/test1DRWXRWX---2 jack Jack 23 October 15:08/test/test116[[email protected] test1]#usermod-g Jack Alex .[[email protected] test1]#ID Jack\uid=1206 (Jack) gid=1206 (Jack) group =1206 (Jack)

Add:

4-R Read Cat CD

2-w Write Echo

1-x execution.

Cat View File Contents

Chmod-w-------------give other groups of users permission to write to a file

chmod o=------------Remove Read permissions for other group users

Chmod o=r-------------give Read permissions to other groups of users

echo Add File Contents

./Ah, txt indicates the command parameter (must have x permission) to execute the file

EG:CHOMD O=rx A.txt

Little white Python Road Linux section 10/28&29