1. User and user group rights management
1.useradd [-r/-u/-G/-D][username]: add user,
-r indicates that the added user is a system user, and the UID is within 500.
-u means to directly specify a UID for the user to use
-G followed by the group name means adding the user to this group
-D. Print out the default value of useradd
2.userdel [-r][username]: delete user
-r means delete along with the user's home folder
3.usermod: modify user information
4.groupadd [-g|-r][groupname]: Create a new user group. (-g followed by GID, -r means to create a new system user group)
5.groupmod [-g|-n]: Modify user group information, -n means modify the name of the user group
6.groupdel: delete user group
7.gpasswd [-A|-a]: User group administrator function
-A: Add users after -A to this user group as administrators
-a: Add subsequent users to this management group
8.grep vbird3 /etc/passwd /etc/shadow /etc/group
9.ps -ef |grep mysql : View the processes related to mysql
10.kill -9 [process ID]: -9 means force, which is the command to kill the process. Process ID found later
11.mkdir: create a directory
12.chgrp: Modify the user group to which you belong
chown: modify the owning user
chmod:permissions
The above 3 followed by -R means recurse to all subfolders below
13. Mount windows shared disk: mount -t cifs -o username=' ',password=' ' 'win shared folder path' 'linux mount path'
举例:mount -t cifs -o username=byf,password=byf //192.168.1.100/share /usr/test
cifs is an internet protocol
df -h can view the mount status