What Is KeySteal? macOS Keychain Exploit Explained
With the dust still not settled after the FaceTime privacy bug, news about another macOS vulnerability is already making headlines in top-tier media. It's called macOS keychain exploit, and if you're a Mac user hearing about it for the first time, do
Jun 17, 2025 am 09:54 AM
How to Clear DNS Cache in MacOS Ventura & MacOS Monterey
Occasionally, Mac users might need to clear and flush the DNS cache in MacOS. This could be necessary after modifying the hosts file or for troubleshooting purposes.Flushing the DNS cache on a Mac is typically an action performed by advanced users. H
Jun 17, 2025 am 09:50 AM
How does the file system structure differ between Linux and Windows?
The file system structure of Linux and Windows is different: 1. Linux is based on the root directory (/) and has a simple structure; 2. Windows is based on the drive letter (such as C:) and has a complex structure. Understanding these differences can help improve development efficiency and data management.
Jun 17, 2025 am 09:39 AM
How to copy a file or directory in Linux using cp?
The common command to copy files or directories in Linux is cp. Its basic usage includes: 1. When copying a single file, use the target location of the source file. If the target already has a file with the same name, it will be overwritten. You can add -i to prompt confirmation; 2. You need to add -r parameters to copy the directory to achieve recursive copy, otherwise an error will be reported; 3. Keep the original attributes available -p or more comprehensive -a parameters; 4. Other techniques include batch copying, display process -v and prohibited overwriting -n, etc. When using it, pay attention to the parameter differences to avoid incorrect operations.
Jun 17, 2025 am 09:37 AM
How to check for open files by a process using lsof?
lsof is a practical tool for viewing the files that the process is using. The basic command is lsof-pPID. 1. You need to search the process ID first through ps or pgrep. 2. After executing the command, you can see all files and network connections opened by the process. 3. The key fields in the output include COMMAND, PID, USER, FD, TYPE and NAME. 4. You can use common combinations such as lsof-i-pPID to display network connections, lsof-uusername to check all process files of a user, lsof-i:80 to view port occupation, lsof-pPID-r1 to monitor changes in real time. 5. Be careful to view permissions for other user processes. You can install them through the package manager when they are not installed.
Jun 17, 2025 am 09:36 AM
You Can Now Run VirtualBox on Apple Silicon (M1 / M2)
Those who use VirtualBox on Mac will be pleased to learn that VirtualBox now runs natively on Apple Silicon ARM processors, such as the M1 and M2.VirtualBox is a virtualization tool that enables you to run other operating systems within containers di
Jun 17, 2025 am 09:36 AM
How to remove a package and all its configuration files?
Complete uninstallation of software packages and configuration files in Linux system requires step-by-step operations: 1. Uninstall the main program using sudoaptremopackage_name; 2. Add --purge parameters or use sudoaptpurgepackage_name to delete the configuration files; 3. Find the residual files through dpkg-Lpackage_name|grep'^/etc\|/home' and delete them manually; 4. Optionally execute sudoaptautoremove to clean up useless dependencies. The entire process requires careful confirmation of the operation object to avoid accidentally deletion.
Jun 17, 2025 am 09:30 AM
Why is my Linux server running slow?
Common reasons for slowing Linux servers include resource bottlenecks, improper configuration, or excessive background process usage. 1. First check the CPU and memory usage, use the top/htop command to see if there is a high process occupancy, combine free-h to determine whether the memory is insufficient, and pay attention to issues such as web server concurrency and database query not optimized; 2. Then check the disk IO performance, use iostat/iotop to see if the disk %util is close to 100%, identify frequently read and write programs such as database logs, and consider upgrading SSD or optimizing queries; 3. Then check the network delay and number of connections, use ping/traceroute to test network delay, observe the connection status through netstat/ss, and optimize H
Jun 17, 2025 am 09:30 AM
What is the difference between Ubuntu, Fedora, and Arch Linux?
Ubuntu is suitable for beginners and users who need stable systems, Fedora is for developers and tech enthusiasts, and ArchLinux provides full control to advanced users. 1. Target users: Ubuntu is suitable for users who need a novice or need an ready-to-use system; Fedora is aimed at developers and technology enthusiasts; Arch is suitable for advanced users who want to learn Linux from the underlying layer. 2. Software update and package management: Ubuntu uses APT, released every 6 months, and LTS supports 5 years; Fedora uses DNF, updates frequently and software is newer; Arch adopts a rolling release mode, uses Pacman, and always provides the latest software, but its stability may be affected. 3. Customization and control: Ubuntu is easier to use but
Jun 17, 2025 am 09:29 AM
Tor Browser: Secure Anonymous Web Browsing in Linux
The primary application we require to perform our internet activity is a browser, a web browser to be more perfect in terms of privacy and security of online activities.Over the Internet, most of our’s activity is logged to the Server/Client machine
Jun 17, 2025 am 09:29 AM
What is Docker and how is it different from a VM?
Dockerisacontainerizationplatformthatpackagesapplicationswithalldependenciesintolightweight,portablecontainers.UnlikeVMs,whichrunfulloperatingsystemsandemulatehardware,DockercontainerssharethehostOSkernel,makingthemfastertostartandmoreresource-effici
Jun 17, 2025 am 09:25 AM
What is the root user and why shouldn't I use it all the time?
The root user is a super administrator account in the Unix-like system and has full access rights, but should not be used daily. Because it can cause misdeletion of files, system crashes or security vulnerabilities. For example, command errors can destroy the entire system, and ordinary user permissions can be used as security protection. In addition, most software is not designed to run as root, which may cause security risks. The root account exists for system-level modifications if necessary, such as installing software or adjusting network settings, but permissions should be temporarily obtained through sudo or UAC. The safe way to use root includes: prioritizing sudo instead of logging in directly to root; avoid running graphical interface programs with root; exiting the root session immediately after completing the operation; restricting the use of sudo to the user.
Jun 17, 2025 am 09:24 AM
How to update the Linux kernel?
Whether the Linux kernel needs to be updated depends on the distribution, hardware compatibility or functional requirements; the system comes with updates on daily use, but you can manually upgrade it when experiencing new features or solving driver problems. Confirm that the current kernel version can be viewed through the terminal input uname-r; it is recommended to use the distribution package manager to update, such as sudoaptupdate&&upgrade&&dist-upgrade with Ubuntu/Debian, sudodnfupdate with Fedora/RHEL/CentOSStream, and select a new kernel after restarting. Advanced users can manually download the source code from kernel.org to compile and install the process package
Jun 17, 2025 am 09:23 AM
How to create a file of a specific size for testing?
How to quickly generate test files of a specified size? It can be achieved using command line tools or graphical software. On Windows, you can use fsutilfilecreatenew file name size to generate a file with a specified byte; macOS/Linux can use ddif=/dev/zeroof=filebs=1Mcount=100 to generate real data files, or use truncate-s100M files to quickly create sparse files. If you are not familiar with the command line, you can choose FSUtilGUI, DummyFileGenerator and other tool software. Notes include: pay attention to file system limitations (such as FAT32 file size upper limit), avoid overwriting existing files, and some programs may
Jun 17, 2025 am 09:23 AM
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