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How to pipe commands together in Linux
PipesinLinux,representedby|,passoutputfromonecommandasinputtoanother.Forexample,ls-l|grep".txt"listsfilesandfiltersfor.txtentries.Commonusesincludecatfile.txt|sortforsortingtext,psaux|grepnginxtofindnginxprocesses,df-h|awk'{print$5}'toextra
Nov 28, 2025 am 05:35 AM
How to clear the command line history in Linux
Usehistory-ctoclearcurrentsessionhistoryand>~/.bash_historytoerasesavedhistory,ensuringcompleteremovalofpastcommands.
Nov 27, 2025 am 02:23 AM
How to list all running processes in Linux
Usepsauxforasnapshotofallprocesses;2.Usetopforreal-timeCPU-sortedmonitoring;3.Usehtopforenhanced,interactiveviewing;4.Usepgreptofindspecificprocessesbyname.
Nov 27, 2025 am 12:03 AM
How to enable and disable services on boot in Linux
MostLinuxsystemsusesystemdtomanagestartupservices;checkwithps-p1.Usesystemctlenable/disabletocontrolbootstartup,andsystemctlstart/stopforimmediateaction.OldersystemsuseSysVinittoolslikeupdate-rc.dorchkconfig.Enableaserviceatbootwithsudosystemctlenabl
Nov 26, 2025 am 03:03 AM
How to set up a basic firewall with iptables in Linux
To configure the iptables firewall, first set the default policy to deny all inbound and forwarded traffic and allow outbound traffic; 2. Then allow local loopback and established connection traffic; 3. Then open necessary service ports such as SSH, HTTP, HTTPS, etc.; 4. Optional configuration logs to record discarded packets; 5. Finally, save the rules to prevent restart loss, ensuring system security and not interrupting normal access.
Nov 26, 2025 am 01:24 AM
How to check which version of Linux I am running
Startwithcat/etc/os-releaseorlsb_release-dtofindtheOSversion,astheseprovidecleardistributiondetailsacrossmostsystems;useuname-rforkernelversion,whichdiffersfromtheOSreleasebutisoftenhelpful.
Nov 25, 2025 am 12:51 AM
How to set the system time and date in Linux
UsetimedatectltomanagetimeanddateinLinux.1.Checkcurrentsettingswithtimedatectl.2.Settimemanuallyviasudotimedatectlset-time"YYYY-MM-DDHH:MM:SS".3.Listtimezonesusingtimedatectllist-timezones.4.Changetimezonewithsudotimedatectlset-timezoneZone
Nov 25, 2025 am 12:13 AM
How to manage services with systemctl in Linux
systemctlisessentialformanagingLinuxserviceswithsystemd.2.Usestart,stop,restartforimmediatecontrolandenable,disableforbootpersistence.3.Checkstatuswithstatus,is-active,is-enabledandviewlogsviajournalctl.4.Reloadconfigurationsusingreloadorreload-or-re
Nov 24, 2025 am 12:55 AM
How to delete a directory in Linux that is not empty
Todeleteanon-emptydirectoryinLinux,usetherm-rcommandfollowedbythedirectoryname,suchasrm-rmy_folder,whichrecursivelyremovesallcontentsandthedirectoryitself.Forforcefuldeletionwithoutprompts,userm-rf,butexercisecautionasthisactionisirreversible.Alterna
Nov 24, 2025 am 12:30 AM
How to find a file in Linux using the command line
Use the find command to find files in Linux by name, type, size and modification time, such as find/home-name "document.txt"; 2. Limit the search type through the -type option, such as f for files and d for directories; 3. Search by size with -size, such as 100M means greater than 100MB, use -mtime according to time, such as -7 means modification within 7 days; 4. The locate command is faster to search based on the database, but you need to run sudoupdatedb to update the database first; 5. Find is suitable for accurate real-time search, and locate is suitable for quickly finding older data.
Nov 23, 2025 am 02:00 AM
How to find a process ID (PID) by name in Linux
TofindaPIDbynameinLinux,usepgrep,pidof,orpswithgrep.1.pgrepprocess_namereturnsthePIDdirectlyandisrecommended;add-iforcase-insensitivesearch.2.pidofprocess_nameretrievesPIDsbyexecutablename,usefulwhenmultipleinstancesrun.3.psaux|grepprocess_namelistsp
Nov 23, 2025 am 12:10 AM
How to restart the networking service in Linux
Usesystemctlonmodernsystems:sudosystemctlrestartnetworking(Debian/Ubuntu)orsudosystemctlrestartnetwork(RHEL/CentOS);usesudoservicenetworkingrestartonoldersystems;verifywithsystemctlstatusandipa.
Nov 22, 2025 am 04:31 AM
How to zip and unzip files in a Linux terminal
TocompressandextractfilesinLinux,usethezipandunzipcommands.First,installthemviayourpackagemanagerifneeded:onDebian/Ubuntu,runsudoaptinstallzipunzip;onRedHat/CentOS/Fedora,usesudodnfinstallzipunzip.Tozipasinglefile,useziparchive.zipfile.txt;formultipl
Nov 22, 2025 am 04:13 AM
How to set up Fail2Ban to protect SSH on Linux
InstallFail2Banusingaptordnf,startandenabletheservice.2.Createjail.localfromjail.confandconfigure[sshd]withenabled=true,correctlogpath,maxretry=3,bantime=3600,findtime=600.3.Verifywithfail2ban-clientstatussshdandmonitorlogstoconfirmprotectionagainstS
Nov 21, 2025 am 01:16 AM
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