What do the numbers in chmod 755 mean?
Chmod755setsfilepermissionsinLinuxwheretheownerhasfullaccess,andgroupmembersandotherscanonlyreadandexecute.Thefirstdigit(7)grantstheownerread,write,andexecute(4 2 1)permissions,theseconddigit(5)allowsthegrouptoreadandexecute(4 1),andthethirddigit(5)g
Jul 04, 2025 am 12:40 AM
How to find out which process is listening on a specific port?
To find out which process is listening to a certain port, you can use the system's own command line tools. 1. Use the netstat command: sudolsof-tulnp|grep: to view the protocol, local address, PID and process name; 2. If netstat is not installed, use the ss command to replace it: sudoss-tulnp|grep:; 3. Use the lsof tool to be more intuitive: sudolsof-i: to directly list the PID, user and protocol; 4. Use the ps command to further search for process information: ps-p. Pay attention to permission issues, system differences, abnormalities in multiple processes listening to the same port, and the impact of firewalls during operation. Mastering these commands can easily deal with port monitoring problems.
Jul 04, 2025 am 12:40 AM
How to compress and decompress files using tar, gzip, and bzip2?
How to package compressed files with tar, gzip and bzip2 in Linux? 1.tar is used for packaging or unpacking: use "tar-cvfarchive.tar file/directory" and unpack with "tar-xvfarchive.tar"; 2.gzip is used for compression or decompression: when combining tar, use "tar-czvfarchive.tar.gz file/directory" to compress, use "tar-xzvfarchive.tar.gz", use "gzip file" to compress individually or use "gzip-d file.gz" to decompress; 3.bzip2 provides higher compression rate: when combining tar, use "tar-cjvfarchive.t
Jul 04, 2025 am 12:26 AM
How to check for hardware errors in Linux?
When you suspect hardware errors, you can troubleshoot them as follows: 1. Use memtest86 to test memory, dmesg to view memory logs, and enable ECC memory support; 2. Use smartctl to detect hard disk health, badblocks to scan bad blocks, and fsck to repair file system; 3. Check CPU exceptions and temperature through dmesg and lm-sensors, and simulate load tests; 4. Comprehensively view the hardware error logs in /var/log/syslog or journalctl. Timely use of these tools can effectively locate common hardware problems such as memory, hard disk, and CPU.
Jul 04, 2025 am 12:24 AM
13 Apk Commands for Alpine Linux Package Management
Alpine Linux is an independent, free, and open-source Linux distribution based on BusyBox and musl. It is a lightweight and security-oriented Linux distribution that comes in a small footprint (about 160 MB). For this reason, it’s widely used in crea
Jul 03, 2025 am 09:31 AM
Zorin OS Lite 16.1 - A Linux Desktop with Windows Feel
Since Linux is founded in 1991, Linux is transformed into a mature operating system, a ready-to-use operating system even for people that have never touched a computer before. Linux at the beginning only had Command Line Interface (CLI). Over time, L
Jul 03, 2025 am 09:25 AM
8 Best KDE Based Linux Distributions That You'll Love
The KDE Plasma desktop is an attractive and feature-rich environment to use. It provides a fluid interface with a touch of elegance that leaves many other Linux desktop environments in the dust. The desktop’s laser focus is on simplicity, as well as
Jul 03, 2025 am 09:24 AM
10 Things To Do After Installing Pop!_OS Linux
Pop!_OS is a rather new player in the world of Linux operating systems but it has quickly risen up the ranks to become one of the more enjoyable options overall. With a custom Pop!_OS Shop and a variety of user experience optimizations, it certainly
Jul 03, 2025 am 09:22 AM
Best Linux Distributions for Scientists and IT Professionals
In the realm of Linux distributions, there are specific categories that have fulfilled their roles effectively for the open-source community. One major benefit of using Linux is the freedom to choose from a wide variety of options. In this context, w
Jul 03, 2025 am 09:21 AM
Best Linux Media Center Distros for Your Home Theater PC
There are a number of Linux media center distros out there, and some of them do more than one thing. But which one is best? Which one provides the most value? And which one is the most well-rounded? As a subset of the Linux family of operating system
Jul 03, 2025 am 09:20 AM
Fortifying Debian With SELinux by Enforcing Mandatory Access Control for Ultimate System Security
In an era where cyber threats are evolving rapidly, securing Linux systems goes far beyond basic user permissions. Traditional security mechanisms like Discretionary Access Control (DAC) offer limited safeguards against privi
Jul 03, 2025 am 09:17 AM
Top 8 YUM/DNF ThirdParty Repositories for RHEL-Based Linux
YUM (Yellowdog Updater Modified) is an open-source, widely used command-line and graphical-based package management tool for RPM (RedHat Package Manager) based Linux systems, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS, Sci
Jul 03, 2025 am 09:14 AM![Installation and Review of Q4OS Linux [Lightweight Distro]](https://img.php.cn/upload/article/001/242/473/175150507396452.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
Installation and Review of Q4OS Linux [Lightweight Distro]
Q4OS is a new Linux distribution that’s based on Debian; a common base that’s shared with other distributions like Ubuntu and Linux Mint. It’s aimed at users who just want a simple, stable, easy to use Linux operating system that they can convenientl
Jul 03, 2025 am 09:11 AM![Installation and Review of Bodhi Linux [Lightweight Distro]](https://img.php.cn/upload/article/001/242/473/175150501577436.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
Installation and Review of Bodhi Linux [Lightweight Distro]
Bodhi Linux is a fresh Linux distribution built upon Ubuntu Linux—which itself is rooted in Debian—designed to be both lightweight and open-source.Being Ubuntu-based, users benefit from the availability of apt, synaptic, and Bodhi’s own AppCenter, of
Jul 03, 2025 am 09:10 AM
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