VI is the short name of visual interface, it is a text editor under Linux/unix, for example, if you want to edit the file English.txt, you can enter the VI english.txt command under terminal and then enter the editing interface.
1:vi Mode
A) General mode: VI when processing a file, one enters the file, which is the general mode.
b) Edit mode: In general mode can be deleted, copy, paste and other operations, but unable to edit the operation. When you press the ' I,i,o,o,a,a,r,r ', the letters are then entered in edit mode. Usually in Linux, when the above letter is pressed, the words ' INSERT ' or ' REPLACE ' will appear in the lower left to enter any text into the file. To return to normal mode, press [ESC] Key.
c) command-line mode: In general mode, enter ": OR/or?" To move the cursor to the bottom line, in which you can search for data, read, save, delete characters, leave VI, display line numbers, and so on.
2:vi Common Commands Summary
2.1: General mode
A) Move the cursor
1, up and down direction key ↑↓←→
2. Page Pagedown/pageup button
3, number 0: Moves the cursor to the beginning of the current line
4. $: Moves the cursor to the end of the current line
5, G: Move to the last line of this file, Ng:n is a number, move to the nth line of this file
6, GG: Move to the first line of this file is equivalent to 1G
b) Search and replace
1,/word: From the beginning of the cursor, query down a string named word.
2,: n1,n2s/word1/word2/g: N1 and N2 are numbers. Look for N2 between the N1 and Word1 lines and replace the string with Word2.
3,: 1, $s/word1/word2/g: look for the word1 string from the first line to the last line, and replace the string with Word2.
4,: 1, $s/word1/word2/gc: look for the word1 string from the first line to the last line, replace the string with Word2, and display a prompt before replacing to confirm that the user needs to be replaced.
c) Delete, copy, paste
1, X,x: In a row, X is the backward deletion of a character (equivalent to the DEL key), X is the forward deletion of a character (equivalent to the BACKSPACE key).
2, DD: Delete the entire line where the cursor is located.
3, Ndd:n is the number. From the beginning of the cursor, delete the down n column.
4, yy: Copy the line where the cursor is located.
6, Nyy:n is the number. The next n rows where the cursor is copied.
7, p,p:p to paste the copied data to the next line of the cursor, p is affixed to the previous line of the cursor.
8. U: Restore previous operation
9, CTRL + R: Redo the previous operation.
10, decimal point '. ': Repeat the previous action.
2.2: Edit mode:
1, i, i : inserts the input text where the cursor is located, and the existing text is backward. i is ' Insert ' from the current cursor where ',i is ' to start inserting ' at a non-whitespace space in the current row.
2, a, a : a to ' insert from the next character where the current cursor is located '. a is ' start inserting ' from the last character of the line where the cursor is located.
3, o,O : This is the case of the English O. o Insert a new line at the next line in the row where the current cursor is located. O means ' insert a new line at the top of the line where the current cursor is located '. The
4, r,r : replace:r replaces the character that the cursor is in. R : will always replace the character of the cursor until the esc key is pressed.
5, esc : into general mode.
2.3: Command mode:
1,: w: Write the edited data to the hard disk
2,: Q: Leave VI
3,: q! : Forced departure, not stored
4: Wq: Store and leave
5,: wq! : Force storage after leaving
Use of the Linux VI editor
