Directory related commands

pwd

pwd yes print work directory abbreviation , Print the current directory , Generally, there are no parameters

cd

cd yes change directory abbreviation , Used to switch the current working directory

 Common operations （ Parameters ）：
1. cd  Absolute path        ## Enter the specified directory , Desperate path from / Start 
2. cd .             ## Continue to stay in the current directory 
3. cd ..            ## Enter the parent directory of the current directory 
4. cd ~             ## Enter the home directory of the currently logged in user 
5. cd -             ## Enter the last directory 

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ls

ls yes list directory contents abbreviation , View contents under the directory

 Common operations （ Parameters ）：
1. ls -l        ## Long format （long）, It can be abbreviated as ll, View the content attributes of specific files in the directory （ file size 、 Creation time 、 user 、 User group permissions ）
2. ls -a        ## Display all files （all）,Linux The hidden file is usually in the form of . start 
3. ls -A        ## Show division .（ Current directory ） and ..（ Superior directory ） All documents other than ,Linux The hidden file is usually in the form of . start 

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