Detailed explanation of PS1, PS2, PS3, PS4 variables under Linux

To manage the startup of Linux services, use the systemctl command. 1. Check the service status: systemctlstatus can check whether the service is running, enabled or disabled. 2. Enable the service startup: sudosystemctlenable, such as sudosystemctlenablenginx. If it is started at the same time, use sudosystemctlenable--nownginx. 3. Disable the service startup: sudosystemctldisable, such as sudosystemctldisablecups. If it is stopped at the same time, use sudosystemctldisabl

Usepsauxforacompletesnapshotofallrunningprocesses,showingdetailedinformationlikeUSER,PID,CPU,andmemoryusage.2.Usetoporhtopforreal-timemonitoringofprocesseswithdynamicupdates,wherehtopoffersamoreintuitiveinterface.3.UsepgreporpidoftoquicklyfindthePIDs

Removeunusedpackagesanddependencieswithsudoaptautoremove,cleanpackagecacheusingsudoaptcleanorautoclean,andremoveoldkernelsviasudoaptautoremove--purge.2.Clearsystemlogswithsudojournalctl--vacuum-time=7d,deletearchivedlogsin/var/log,andempty/tmpand/var

ToviewfilecontentsinLinux,usedifferentcommandsbasedonyourneeds:1.Forsmallfiles,usecattodisplaytheentirecontentatonce,withcat-ntoshowlinenumbers.2.Forlargefiles,uselesstoscrollpagebypageorlinebyline,searchwith/search_term,andquitwithq.3.Usemoreforbasi

The steps to set up alias in Linux are as follows: 1. Temporarily set the use of the alias command such as aliasll='ls-la'; 2. Permanently set the shell configuration file, such as ~/.bashrc, and then execute the source to take effect; 3. Be careful to avoid overwriting the original command and the different shell configurations are independent. Alias can simplify complex commands and improve efficiency, but only after the current shell environment takes effect and closes the terminal, it needs to be reasonably defined and regularly checked for configuration.

First, confirm that the device is connected to the Wi-Fi of the target router or connected through a network cable; 2. Enter http://192.168.10.1 in the browser address bar and press Enter; 3. Enter the correct username and password (default is often admin/admin or view the back of the router); 4. If it cannot be opened, check whether it is connected to the wrong network, confirm the correct IP address (you can view the default gateway through ipconfig), restart the router, change the browser or turn off the firewall; 5. After logging in, you can modify the Wi-Fi name password, set security options, configure port forwarding, enable guest network, upgrade firmware, etc.; 6. If you forget your password, you can reset the factory settings by pressing and holding the router reset hole for 5-10 seconds, but all configurations will be cleared.

ForDebian/Ubuntu,usedpkg-loraptlist--installedtolistinstalledpackages.2.ForRedHat/CentOS/Fedora,userpm-qaordnflistinstalled.3.ForopenSUSE,usezyppersearch--installed-onlyorrpm-qa.4.ForArchLinux,usepacman-Q,withpacman-Qeforexplicitlyinstalledpackages.A

Systemdisthefirstprocess(PID1)inmodernLinuxsystems,replacingolderinitsystemslikeSysVinitandUpstart,responsibleforbooting,managingservices,devices,logs,andusersessionsthroughasuiteofintegratedtools.2.Itusesunitfiles(.service,.timer,.socket,etc.)todefi