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How to grant sudo privileges to a user in Linux
Addtheusertothesudoorwheelgroupusingsudousermod-aGsudousernameforDebian/Ubuntuorsudousermod-aGwheelusernameforRHEL/CentOS/Fedora,thenverifythe/etc/sudoersfilehasthecorrectpermissionsenabledviavisudo,andtestwithsudowhoamitoconfirmaccess.
Nov 14, 2025 am 01:52 AM
How to troubleshoot high memory usage
To solve the problem of excessive memory usage, you need to first check the memory usage. Use the Task Manager for Windows, the Activity Monitor for macOS, and the top or htop command for Linux. Secondly, close unnecessary programs, services, and browser tabs. Then check whether there are memory leaks and analyze them with tools such as VisualVM, MAT, and Valgrind. Finally, consider adjusting system settings such as virtual memory, releasing cache, or upgrading hardware to increase memory. Through these steps, you can effectively optimize memory usage and improve system stability.
Nov 13, 2025 am 11:12 AM
How to check which ports are open on a Linux server
Usess-tulntoquicklylistallopenports;formoredetail,usenetstatornmap.ThesscommandshowslisteningTCPandUDPportsnumerically,whilenmapprovidesexternalscanningcapabilities,andbothhelpverifyspecificserviceslikeSSHorHTTP.
Nov 13, 2025 am 09:32 AM
How to find the hardware information of a Linux system
UselscpuforCPUdetails,free-hforRAM,lsblkanddf-hforstorage,iplinkfornetworkinterfaces,andsudolshwforafullhardwareoverview;mosttoolsarepre-installedoravailableviapackagemanager.
Nov 12, 2025 am 01:16 AM
How to create a cron job in Linux
Usecrontab-etoeditcronjobs,followthesyntaxminutehourdaymonthweekdaycommand,setabsolutepathsandpermissions,savewithCtrl O/Ctrl Xinnanoor:wqinvi,thenverifywithcrontab-l.
Nov 12, 2025 am 12:07 AM
How to set up SSH keys for passwordless login in Linux
GenerateSSHkeypairusingssh-keygenwith4096-bitRSA;2.Copypublickeytoserverviassh-copy-idormanualappendto~/.ssh/authorized_keys;3.Setproperpermissions:~/.ssh(700),authorized_keys(600);4.VerifyPubkeyAuthenticationisenabledinsshd_configandrestartSSHservic
Nov 11, 2025 am 05:42 AM
How to format a disk drive in Linux
First,identifythecorrectdiskusinglsblktoavoiddataloss;thenoptionallycreateapartitionwithfdisk;next,formatitwithmkfs.ext4,mkfs.vfat,ormkfs.exfat;finally,mountthedriveviamkdirandmountcommands,andconfigure/etc/fstabforautomaticmountingatboot.
Nov 11, 2025 am 04:26 AM
How to list all network interfaces in Linux
Useiplinkshowtolistallnetworkinterfaces,includinginactiveones—thisistherecommendedmethodonmodernLinuxsystems.
Nov 10, 2025 am 02:40 AM
How to change a user's password in Linux
Usepasswdtochangeyourpassword;withsudopasswdusername,adminscanchangeothers'passwords;usesudochage-d0usernametoforceapasswordresetatnextlogin.
Nov 10, 2025 am 12:32 AM
How to disable SELinux temporarily or permanently in Linux
CheckSELinuxstatuswithsestatustoconfirmcurrentmode.2.Temporarilydisableenforcementusingsetenforce0,whichtakeseffectimmediatelybutdoesnotpersistafterreboot.3.Forpermanentdisable,edit/etc/selinux/config,setSELINUX=disabled,thenreboot.4.Verifyfinalstatu
Nov 09, 2025 am 01:26 AM
How to install a LAMP stack (Apache, MySQL, PHP) on Linux
Install Apache: run sudoaptinstallapache2 and start the service; 2. Install MySQL: execute sudoaptinstallmysql-server and run the security script; 3. Install PHP: use sudoaptinstallphplibapache2-mod-phpphp-mysql; 4. Test integration: Create a test file for PHP to connect to MySQL. If the access page shows success, the LAMP stack will work normally.
Nov 08, 2025 am 03:00 AM
How to copy a file from a local machine to a remote Linux server
ThemostcommonmethodtocopyafilefromyourlocalmachinetoaremoteLinuxserverisusingscp,whichencryptsdataandusesSSHauthentication;forexample,scp/path/to/local/fileusername@remote_host:/path/to/remote/directorycopiesafilesecurely,whileaddingthe-Pflagspecifie
Nov 08, 2025 am 01:42 AM
How to count the number of files in a directory in Linux
Tocountonlyfiles,usefind/path/to/directory-typef|wc-l;2.Forallentries,usels-1|wc-l;3.Includehiddenfileswithls-1A|wc-l;4.Forprecision,useprintf'%s\n'|wc-lorincludehiddenfilessafelywithprintf'%s\n'.*2>/dev/null|grep-v'^.$|^..$'|wc-l.
Oct 30, 2025 am 04:19 AM
How to flush the DNS cache in Linux
MostLinuxsystemsusesystemd-resolvedforDNScaching,andtheprimarymethodtoflushDNScacheisrunningsudosystemd-resolve--flush-cachesorsudoresolvectlflush-cachesonnewerversions;however,firstconfirmifacachingservicelikesystemd-resolved,dnsmasq,orunboundisacti
Oct 30, 2025 am 03:02 AM
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