Linux delete, backup, compression and other commands

to sum up:

ls View all files under the current directory
   -a Display all files (including hidden files)
   -l Display all files (including detailed information of files)
       ls Parameter directory path (absolute path / relative path)

   cd
   pwd Display current location

touch create file
   touch create common file
   format:
       touch common file name
   mkdir create directory file
       format:
       mkdir directory file name

vim edit file
   three modes:
       unedited mode
       edit mode
       command line mode

       enter edit mode: a
       exit edit mode: esc
       enter command Mode::
       Exit command mode: backspace (backspace key)

   editing skills:
   yy copy
   p paste
   dd delete
   u undo
   Ctrl + r undo undo

   Note: all operations in this part are in unedited mode

   Command line mode:
   / keyword search keyword
   wq Save
   q! Forced exit

   anchor symbol:
   ^ current first line position
   $ current line end position
   gg current document first line first character position
   G The first character position of the last line of the current document

cat View file
       -n While viewing the file, display the line number

mv move file
       mv move file, or file name
           move format: mv source file destination location
           Rename format: mv source file new file name
               Note: The new file name must be unique in the current file

       rm delete file
           -f delete ordinary file
           -rf delete directory file
               format: rm parameter file to be deleted

       cp file copy
           -f copy directory
               copy file format:
                   cp source file destination location
                   cp source file new file name (in current directory)

               Copy directory file format
                   cp -r source file destination location
                   cp -r source file new file name (in the current directory)
file decompression
   tar file decompression
       compressed file format:
           tar zcvf compressed package name file to be compressed
       Decompressed file format:
           tar xf compressed package name
   unzip Decompressed zip file
       format:
           unzip compressed package name

Link file:
   ln
       format:
           ln -s source file soft link file
Download file:
   wget
       format:
           wget url