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├──etc for configuration files ├──home User's home directory-Normal user's home directory:/home/username ├──lib link library ├──lib64 ├──lost+found ├──media ├──mnt ├──opt a directory for some large software or some special software ├──proc system kernel mappings ├──root Administrator Root home directory:/root ├──sbin ├──selinux ├──srv ├──sys ├──tmp for temporary files ├──usr used to hold user's installer files └──var Most of the logs are stored Shortcut key

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us to use the following executable file as the/tmp/command. If you want the modified PATH to take effect permanently:[Email protected] ~]# Vim/etc/profileAdd the following line to the file:Path=: $PATH:/tmpOf course, the above modification is for all users, in order to target a user, modify:[[email protected] ~]# vim./.bash_profileAfter modification, the restart takes effect or uses the source command:[Email protected] ~]# source/etc/profile//Source ~/.bash_profile5.Linux shortcut keys:Ctrl + C

directory,.. Represents the previous level of the directoryNote that the absolute path, relative path concept is distinguished, where the absolute path is the From/start4. Use of the environment variable pathecho $PATH can view the value of the system's environment variable path and use the which command to see the absolute path of a commandPath= $PATH:/tmp so that we can use the executable file/tmp/as a commandTo make the path permanent, you need to add it to the/etc/profile, restart it, or ru

of a commandPath= $PATH:/tmp so that we can use the executable file/tmp/as a commandTo make the path permanent, you need to add it to the/etc/profile, restart it, or run the command directly:Source/etc/profileAlias settings command aliases, such as Alias Aming= ' Ls-lt 'De-alias using Unalias amingTo make the alias permanent, you need to add the alias command to ~/.BASHRC.5. Shortcut keysCTRL + C Cancel commandCTRL + Z Pause commandCTRL + a cursor to the beginningCtrl+e cursor to end of lineCtr