liunx the vi editor shortcuts

4. Operating system shortcuts
   1) using the arrow keys ↑ ↓ --- fast retrieval of historical command (command input will be temporarily stored in memory -> Save the file to disk)
   2) move the cursor quickly
   ctrl + a --- Move the cursor fast move to the beginning of the line
   ctrl + e --- quickly move the cursor to the end of the line
   ctrl + ← → --- the cursor left move as fast word
   3) fast operation command information
   ctrl + u --- the content before the cursor cut
   ctrl + k --- contents after the cursor shear
   ctrl + w --- shear each separated by a space character string information as
   ctrl + y --- paste the contents of the cut
   4) special function shortcut
   ctrl + c (cancel) --- interrupt or cancel the command execution process
   ctrl + l (clear) --- clear screen operation
   ctrl + s --- into the locked state
   ctrl + q --- exit the locked state

5. Use editing commands VI / Vim
   . 1) Edit Mode command information
   command mode: special functions in the operation
   edit mode: editing the file contents information
   line mode: special command can enter information wq q wq q!!

   Command mode -i-> Edit mode -esc-> Command Mode
   Command Mode -: -> line mode -esc-> command mode

   2) Command mode ---> Edit Mode
   I --- at the cursor location directly into the editing mode
   I --- move the cursor to the beginning of the line to enter the edit mode
   A --- a character enters edit mode at the cursor position
   A --- end of the line the cursor is switched to enter the edit mode
   O --- inserted below the cursor line a new line, and enter the edit mode
   O --- insert a new row in the row above the cursor, and enter the edit mode
   s --- delete the character at the cursor position and enter edit mode
   S --- delete the cursor line and enter edit mode oh

   3) Command Mode ---> bottom line mode
   : --- entering in the end-line mode, complete functional operation q WQ WQ WQ!!
   / --- Search File information n N look up look down
   --- Search File information? n look up N lookup down
   PS: ignore case lookup data file
   / Oldboy \ C
   . 4) how to quickly move the cursor (command mode)
   G --- switch to the last line
   GG --- a first switch to a file line
   100G --- switch to the file specified line
   100gg
   ^ --- switch to the beginning of a line
   $ --- switch to the end of a line

   5) how to do special editing operation
   yy --- copy specified line information
   nyy --- copy multiple lines of information
   content p --- paste the copied at the specified line
   content np --- copy of the specified line in that sticks times
   dd --- delete the specified line information (in real terms is cut)
   NDD --- delete the specified multi-line message (the essence is the shear)
   dG --- all lines after deleting the contents of the cursor
   C --- delete the contents after cursor enter the edit state and
   R & lt replace the specified character information ---
   R & lt plurality of character information for successive replacement ---
   6) commands operation of the special function mode
   U --- withdrawal operations Use the undo
   Ctrl + R & lt canceled withdrawn redo ---

   Line mode special feature operation
   : set nu --- display line numbers
   : set nonu --- cancel the line number display
   error 04: error message is displayed, not the normal editing
   cause of the problem:
   1) When you edit a file, a sudden interruption
   2) file by multiple users to simultaneously edit the

   Conduct problem solving:
   problem: Solution
   First course: recover data before the interruption information
   vi -r edit file information
   Second course: delete a hidden file
   Description:. Linux file system to start is the hidden files
   using the ls -a view hidden files
   rm -f /oldboy/oldboy.txt.swp

6. Editing commands Common Errors
   Error 01: editing commands can only edit the file
   Error 02: You must specify the file you want to edit
   error 03: Edit the file directory must exist
   Error 04: error message is displayed, not the normal editing
   analyze cause of the problem:
   1) Edit the file, there is a sudden interruption
   2) file by multiple users to simultaneously edit the

   Conduct problem solving:
   problem: Solution
   First course: recover data before the interruption information
   vi -r edit file information
   Second course: delete a hidden file
   Description:. Linux file system to start is the hidden files
   using the ls -a view hidden files
   rm -f /oldboy/oldboy.txt.swp

   vi command execution principles
   1) Edit the file will have a hidden file
   2) is directly edit content in a hidden file
   3) When you save the file is a hidden file rename operation
   directory structure linux system / directory information
   PS: the system all the data are file
   boot --- hold a boot system boot file system similar to windows c: / windows
   etc --- system services configuration file directory
   opt / usr --- save the third software program users install directory files program
   root --- system user's home directory super user's home (palace)
   home --- system user's home directory ordinary user's home (slums)
   var --- the system log file directory
   tmp --- temporarily store data directory is similar to windows recycle bin
   sbin --- binaries == binary command file Super
   bin --- binaries == command file binary
   dev --- ??????
   mnt --- ??????
   Media audio video store --- picture
   SYS / proc --- ???
   lib --- library adjusted sauces development code requires the use of the library you want to save the file directory 32 program library files
   needed to lib64 --- library 64-bit program library files
   directory level official data: HTTP: //www.p athname.com/fhs/pub/fhs-2.3.html

7. Course knowledge summary carding
   1) command to get help information man command / --help help / builtin
   2) operating system shortcuts
   3) Edit command skills
   4) editing commands common errors
   5) operating system directory structure