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How to Change File Ownership in Linux with chown? (Command Examples)
chownchangesfile/directoryownershipquicklyandpreciselyusingchown[owner][:group]file;supportsrecursive-R,numericIDs,shortcutslike.,andrequiressudofornon-rootusers.
Dec 14, 2025 am 12:26 AM
How to Install MySQL on a Linux Server? (Secure Installation Guide)
To safely install MySQL, you need to install it with the official package manager, run mysql_secure_installation immediately for reinforcement, bind the local address, disable dangerous functions, and create a dedicated application user.
Dec 13, 2025 am 03:24 AM
How to use grep to search for strings in files on Linux
grepisapowerfulLinuxcommandforsearchingtextusingpatterns;itsupportscase-insensitivesearcheswith-i,showslinenumberswith-n,countsmatcheswith-c,searchesmultiplefilesordirectoriesrecursivelywith-r,invertsresultswith-v,andhandlesregularexpressionsforadvan
Dec 13, 2025 am 01:36 AM
How to use fail2ban for SSH security
Fail2ban automatically blocks SSH login IPs that frequently fail by monitoring logs to improve server security. During installation, use the package manager to install fail2ban, copy jail.conf to jail.local and enable the [sshd] configuration section; set bantime=86400, findtime=600, maxretry=5 to optimize the banning strategy; use the fail2ban-client command to check the status or unblock the IP; also pay attention to the correctness of the log path, firewall backend cooperation, email notification and other additional configurations to ensure the protection effect.
Dec 12, 2025 am 04:50 AM
How to Find Files in Linux Using the find Command? (With Examples)
find is the most powerful and flexible file location tool in Linux. It supports recursive search by name, type, size, time and other conditions without indexing. You can use -name/-iname to match file names, -maxdepth to limit depth, -prune to skip paths, -mtime/-size to filter time and size, and -exec to execute commands.
Dec 12, 2025 am 12:15 AM
How to Monitor CPU Usage in Linux? (Using top and htop)
Both top and htop can monitor Linux CPU usage in real time. top is pre-installed but has a simple interface. htop needs to be installed but supports color display, mouse operation and multi-core visualization.
Dec 11, 2025 am 02:01 AM
How to Check System Uptime in Linux? (uptime Command Explained)
The uptime command can quickly check the Linux system running time and load information: it displays the current time, running time, number of logged-in users and 1/5/15 minute average load; it supports -p (English format), -s (start time), -V (version) and other options; the bottom layer reads /proc/uptime file calculation.
Dec 10, 2025 am 02:19 AM
How to bring a background process to the foreground
You can switch tasks through job control in the terminal without opening a new tab or reconnecting. The specific method is as follows: 1. Use the jobs command to view the tasks currently running in the background; 2. Call the specified task back to the foreground through fg% task number; 3. If there is no task number, use psaux|grep to find the process PID and use kill-CONT to resume operation; 4. To suspend the foreground process, use Ctrl Z, then enter bg to put it into the background, jobs to confirm the status, and fg to switch back to the foreground. Proficiency in these commands can improve the efficiency of terminal operations.
Dec 10, 2025 am 12:59 AM
How to mount a USB drive from the terminal in Linux
FirstidentifytheUSBdeviceusinglsblkorsudofdisk-l,thencreateamountpointwithsudomkdir/mnt/usb,mountthedriveusingsudomount/dev/sdb1/mnt/usb(specifyingfilesystemtypeifneeded),accessfilesviathemountdirectory,andunmountsafelywithsudoumount/mnt/usb.
Dec 09, 2025 am 01:44 AM
How to set up a VPN server on Linux with OpenVPN? (Step-by-Step)
To build an OpenVPN server, you need to install OpenVPN and easy-rsa, build a CA and generate a key certificate, configure server.conf, enable IP forwarding and firewall rules, and finally distribute the secure client.ovpn file.
Dec 09, 2025 am 01:18 AM
How to kill a process in Linux by name or PID? (kill & pkill)
Use the kill command to terminate the process by PID, pkill matches the process by name or pattern; try the SIGTERM signal first to avoid abusing SIGKILL; services should be managed using systemctl.
Dec 08, 2025 am 04:49 AM
How to enable the UFW firewall on Ubuntu Linux
EnableUFWtosecureUbuntubyfirstcheckingstatuswithsudoufwstatus,thenactivatingitviasudoufwenablewhichblocksincomingandallowsoutgoingtrafficbydefault;optionallysetpolicieslikesudoufwdefaultdenyincomingandallowessentialservicessuchasSSH,HTTP,andHTTPSusin
Dec 08, 2025 am 04:38 AM
How to change file ownership in Linux with chown
TochangefileownershipinLinux,usethechowncommand;forexample,"sudochownalicedocument.txt"changestheownertoalice,while"sudochownbob:developersproject.log"changesbothownerandgroup,and"sudochown:developersscript.sh"changesonl
Dec 07, 2025 am 01:10 AM
How to Check the Linux Kernel and Distribution Version? (uname & lsb_release)
Use uname-r to view the Linux kernel version, lsb_release-a or cat/etc/os-release to view release information; the former only displays the kernel, and the latter provides detailed information such as release ID, version number and code name.
Dec 07, 2025 am 01:02 AM
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