How to solve the time synchronization between Linux and Windows dual systems
What the editor wants to share with you here is about solving the time synchronization problem between Linux and Windows dual systems. Under dual computer systems, we found a problem when using Linux and Windows systems, which is the time synchronization problem (UTC&localtime). Linux UTC is used, but windows uses localtime by default, so how to solve it? Let’s take a look! 1. First enter windows and use regedit to write the DWORD value (set to hexadecimal "1"): HKEY_LOCAL_MACHINESYSTEMCurrentControlSe
Jun 24, 2024 am 07:35 AM
Linux installation OpenJDK tutorial: from checking the system's own version to deleting to downloading and installing
Table of Contents 1. Install OpenJDK1 on Linux and check whether the system has its own version. Since some Linux systems have their own version of OpenJDK, we can first check whether they have their own Chinese Linux operating system by executing the following command. If there is java-version, but the version meets the usage conditions, then there is no need to install it. However, the version is not the Linux system log we need, then we need to delete it. 2. Delete OpenJDK#1, and check the jdk installation package rpm-qa | grepjava#2. Delete the packages one by one rpm-e--nodeps+package name#3. Check whether the deletion is complete rpm-qa|grepjava3. Download Op locally
Jun 24, 2024 am 06:32 AM
Analysis of Red Hat Linux9 version network management and three network connection methods of VMware virtual machines
This article uses Red Hat Linux9 version as an example to explain. The network management of Red Hat Linux 9 version is very comprehensive and network configuration changes can be made in many places. However, it should be noted that in version 9, users can make network configuration changes in the configuration file, but the system will not. Execute the changed command, which is executable in versions prior to version 9. Three types of network connections on VMware virtual machines: bridge mode: connect the network card on the host to the virtual network card Vmnet0 through a virtual hub. In bridge mode, the network cards of the virtual machine are connected to the virtual switch Vmnet0. When the virtual machine wants to access the Internet Is the Linux system easy to use when managing the Linux system and network? It is necessary to configure the virtual machine IP address, subnet segment, network segment, etc. with the host network.
Jun 23, 2024 pm 03:34 PM
Linux privilege escalation techniques: Detailed analysis of kernel privilege escalation and suid privilege escalation
For Linux packing, the premise is to get a low-privilege account and Linux scheduled execution script instance, which can upload and download files. The main ideas are: 1. Kernel packing. There are many payloads from various predators on the Internet. The key is to be able to find which exploit to use and how to use it. A less labor-intensive way is to use searchsploit or linux-exploit-suggester.sh to search. It is not difficult after you are familiar with it. 2. suid packing. This also includes sudo forms. The ideas of both methods are the same. The difference is that suid is for a single program and sudo is for a user. The main idea of this type of packing method is: the administrator authorizes ordinary users to execute r
Jun 23, 2024 am 07:59 AM
Detailed explanation of tar compression and decompression commands under Linux system and its application in penetration courses
The penetration course has reached the access injection class, and I feel that this is my dilemma. There is higher-level knowledge behind this class waiting for me to get in touch. In this blog, I will first write about some sentence patterns under the Linux system that are often encountered when doing miscellaneous questions. The last time I blogged, I wrote about web penetration seriously. The five tar compression and decompression commands under Linux tar are independent commands. Red Hat Linux System Download requires one of them for compression and decompression. It can be used in conjunction with other commands but only one of them can be used. The following parameters are optional when compressing or decompressing files as needed. The following parameter -f is required -f: use the file name. Do not use the file name. This parameter is the last parameter and can only be preceded by the file name. #tar-cfall.tar
Jun 23, 2024 am 06:16 AM
Introduction to Linux Basics View, Add, Modify, and Delete User Commands
1. View user information in the /etc/passwd file and match the user login name to the corresponding UID value. It contains some user information: Linux basics for viewing, adding, modifying, and deleting user commands Introduction to Linux basics for viewing, adding, modifying, and deleting The user command introduction is divided into 7 columns with commas as delimiters, which are: We can directly change this file to add, delete, and modify accounts, but it is highly not recommended. This is very dangerous. If it is damaged, it will make it difficult for users to log in. . 2. Common usage of useradd to add accounts: Code language: javascript copy useraddusername-m-s/bin/bash-d/home/username
Jun 22, 2024 pm 03:37 PM
How to solve '/bin/bash^M: bad interpreter' in Linux
Reason: Such an error is prompted when executing a shell script mainly because the shell script file is in dos format, that is, the end of each line is identified by \r\n, while the end of the line of the file in unix format is identified by \n. Solution: ( 1) Use the linux command dos2unixfilename to directly convert the file to unix format; (2) Use the sed command sed-i"s/\r//"filename or sed-i"s/^M//"filename to directly replace the ending character It is in unix format; (3) vifilename opens the file and execute: setff=unix to set the file to
Jun 22, 2024 pm 12:00 PM
linux files are authorized to users. Linux security model: wide limit is tight, and time is enough to stagnate.
Overview of the Linux security model. Linux uses User (user) and Group (group) to control users' access rights to files. Users created in the Linux system can use accounts and passwords. Log in to Linux. The Linux system treats everything as a file. Each file has an owner, but the owner belongs to a certain Group. User Each user in the Linux system has a unique UserID. User information is stored in /etc/passwd. The format example of this file is as follows: root:x:0:0:root:/root:/bin/bash The corresponding meaning of one bit is: username:password:user
Jun 22, 2024 am 10:32 AM
Two forms of ARP attacks and defense methods, detailed analysis
There are two ways to prevent ARP attacks under Linux. The first is to mislead your server to tell you that the MAC of the network segment is another. The second is to mislead the network segment linux video, telling the network segment that the MAC of your server is another one. For the first type, you can use the arp-s network segment IP network segment MAC command to set up static arp record defense. For the second type, you can use the following method to handle Linux security hardening. Since it is source code compilation, I will not go into it later. Go check the specific software packages required for ubuntu source code installation tarzxvf-cd-/sudo./configuresudomake. If you are prompted that the command is insufficient, you can use apt-
Jun 22, 2024 am 08:59 AM
Application of efficient log library under Linux
Due to the inherent characteristics of the log itself, records are inserted sequentially from left to right, which means that the records on the left are "older" than the records on the right. In other words, we do not need to rely on the system clock. This feature is very useful for distributed Very important to the system. It is unknown when the application log appears in the database. It may be that the concept is too simple. In the database field, logs are more used to synchronize data and indexes when the system crashes, such as redolog in MySQL. Redolog is a disk-based data structure used to ensure the accuracy of data when the system crashes. sex and completeness, also called pre-written log. For example, during the execution of a thing, redolog will be written first.
Jun 22, 2024 am 04:57 AM
Installing Google Chrome browser on Ubuntu and solving possible errors
Installation 1. Download the deb package (Ubuntu is used as an example in the following article). Scroll to the bottom of the Google Chrome web browser and select other platforms->linux->deb package 2. Upload to Ubuntu dpkg-igoogle-chrome-stable_current_amd64.deb if prompted. Just install whatever is missing. ps: centos can use yum+rpm package name to find dependencies manually. Ubuntu has not tried apt to find the dependencies. 3. Under normal circumstances, the bid for Kirin Linux Deep Linux is completed. The installation is over at this point. Desktop The version of Ubuntu has a Microsoft browser menu icon for Linux such as
Jun 21, 2024 pm 07:17 PM
Solve the problem that the network card configuration file cannot be found after adding a new network card in CentOS
After using the VMware Workstation virtual machine to install the CentOS7 virtual machine, there is a problem that CentOS7 does not have a network card configuration file after adding a network card. After adding a second network card, after entering the CentOS7 system, the network card configuration file cannot be seen. After entering the CentOS7 system, use ipaddr to check the status as follows: It is found that both ens33 and ens77 have IP addresses and can be used normally. ens33 uses a manually configured IP, and ens37 uses an IP address automatically obtained by dhcp, but /etc/sysconfig/ The ifcfg-ens37 configuration file cannot be found in the network-scripts/ directory. Solution: 1. Use
Jun 21, 2024 am 08:04 AM
Best Way to Install Google Chrome Browser on Ubuntu Linux Using Terminal
We can install Google Chrome browser on Ubuntu Linux using both GUI and command line methods. How to install chrome in linux, however, the terminal is the best way to configure Chrome browser. Here, we discuss how to use it. There are dozens of browsers, and even Linux systems like Ubuntu come with their own default browser Mozilla Firefox. But how to install chrome on Linux, many people are either not satisfied with it, or they just want to install their favorite browser, such as Chrome. Installing applications on Linux is not difficult, but what are the best ways to do it? In fact, it is a terminal, because it only requires a few commands
Jun 21, 2024 am 06:12 AM
How to unzip zip folder in Linux system? Detailed steps to share
How to unzip zip folder in linux? In Linux systems, you can use the unzip command to unzip a zip folder. The following are the specific steps: Open the terminal: In Linux systems, you can open the terminal by clicking the terminal icon or using the shortcut key Ctrl+Alt+T. Switch to the directory where the zip file is located: Use the cd command to switch to the directory containing the zip file. For example, if the zip file is located in the /home/user/ directory, you can enter the following command: cd /home/user/ to decompress the zip file: Use the unzip command to decompress the zip file. The following is the basic command format for decompressing zip files: unzip filename.zip such as, if
Jun 20, 2024 pm 03:32 PM
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