Learning experience for Linux systems first article

1.linux Open Terminal, two of the simplest methods, the first, direct ctrl+alt+t; second, alt+f2, input gnome-terminal; more complex is not recommended.
2.linux There is no concept of the drive letter, only the path, divided into relative path and absolute path; The absolute path is represented as:/path name, a detailed path from the root directory or home directory, and a relative path that represents the path of the current directory.
3.linux system case-sensitive, terminal ls view, blue color for the folder, the white color for the file, use Ls-l to view the file, the left of the letter D means that these are folder information, for-the content of these questions, and the other-L- H can represent the size of the folder from standard bytes as a human understanding, such as 1024kb=1m, so that we look more intuitive. -LH and-l-h as a result,-lha represents all files.
4. Hidden files and hidden folders are used to configure system application files in the system.
5.touch+ folder name, no file to create the file, the file exists on the last modification of the file date, the same as the hidden file.
6. When using the Mkdir+ folder, to confirm the file and folder name, the Linux system does not allow the same name files and folders exist.
7.linux System use RM command to be careful, file deletion will not be restored, and the graphical interface is different.

8. ~ Indicates home directory.
   9. Use CP or MV and other commands, preferably with-I, to ensure that the file other problems can be confirmed, because the operation is not recoverable, remember.
   Here are the commands:
   The command corresponds to the English function
   LS List view the contents of the current folder
   Ls-a Ls-all Show All files (including hidden files)
   Ls-l displaying details as a list
   Ls-h with-l to display file sizes in a humane way
   PWD Print Work Directory view the folder directory where you are currently located
   CD Change Directory "Toggle folder
   CD back to top-level directory
   CD folder name into the directory where the folder name is located
   Cd. Enter this catalogue
   Cd.. Go to the top level directory
   CTRL + C ends the current command "
   CD ~ Returns the current user's home directory
   CD-can be switched back and forth in the most recently used two directories
   Touch Touch "If the file does not exist, create a new file
   Touch 123.txt Create 123.txt
   Touch. 123.txt Create a hidden 123.txt "
   mkdir make directory Create directory
   RM Remove "Remove the file name of the binding
   RM 123.txt
   Rm. 456.txt "
   Clear clear Clear screen
   Command "-options" "parameter" parameter parameter "" means optional command
   Command--help-followed by options--followed by command query commands
   Man Command manual Command manual
   Wildcards act as special symbols to represent other characters.
   • Represents any number of characters Fu Cha see the file can be used to represent more than one character, and key characters in combination with
     ？ On behalf of any one word Fu Cha see the file can be used? Represents another character, used in conjunction with a key character
     [] represents the group of characters to match and ? Usage, just add a group of characters that need to be matched in [], as long as it belongs to this group of characters, it can be displayed
     mkdir Create a new directory
     Mkdir-p a/b/c/d/e folders and files cannot create multiple recursive folders with the same name, the command means to create an E folder below the C folder under the B folder under the A folder below the D folder
     Rm-r the contents of a recursive delete directory, delete the folder must add this parameter
     Rm-f forced deletion, ignoring nonexistent folders without prompting
     Rm-r * Delete all files in directory
     Tree displays the directory, if not, go to the package download install, command: sudo apt-get install tree
     Tree ~ Displays the root folder's trees directory
     CP source file destination file copy files and directories
     "Eg:cp ~/documents/123.txt./desktop/489.txt
     CP ~/documents/123.txt./desktop "Copies the 123.txt under Documents to Desktop and is named 489.txt, and if the file name does not want to change, point directly to the target directory.
     Cp-i source file destination file copy files and directories are prompt before overwriting files
     Cp-r source file The destination file will be recursively copied to all subdirectories and files under the directory, but the directory file must be a directory name
     MV Move
     MV source file destination files and folders can be moved, directory cannot be moved
     EG:MV ~/desktop/test ~/documents/test The test folder under Mobile Desktop to the Documents under the test
     Mv-i source file target file pass CP in the same way that the-I prompt principle

Learning experience for Linux systems first article