VI command details

One 、vi Commands are divided into three modes , Command mode 、 The input mode 、 Last row mode

Command mode

• Move the cursor     Beginning to end end perhaps $  
• Multi line jump ： First jump to the number of lines as you want   Press G The last line ：GG    first line ：gg
• Copy entire line ：yy（ Duplicate a row ）
• Paste ：p
• Cut the whole line ：dd
• Delete words ： x
• revoke ：u    U： Undo all
• replace text ：r   
• Find content ：/      /+ The word you want    n： Down   N： Up
• According to the line Numbers set nu

The input mode

•   The command jumps to input mode ： Press i（ Insert... At the current cursor ）
•   Press o： Insert... In the next line O: Insert... In the previous line
•   Press esc Go back to command mode

Last row mode

    Replace find

                General formula ： Range    s/ Old character （ You can use wildcards ）/ New characters / Modifier

                s： Search for commands

      Modifier ：

              g： Replace everything you find , If not g By default, only the first one found is replaced

               i ： Case insensitive

               c： Ask you （ Need to change ）

                % s/^/#/g: Add # Number