Basic CentOS vi operations

Basic CentOS vi operations

1. About exit

: Wq! ---- Force save and exit
: Wq ---- save and quit
: X ----- works the same as: wq
ZZ ---- has the same role as: wq (note that Z is capitalized and not in command mode)
: Q ---- exit
: Q! --- Force exit

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2. About mobile

H: Move a character from the current row to the left.
J: Move to the next row
K: Move to the previous row.
L: move one character to the right of the current row
Ctrl + f: Scroll one page forward
Ctrl + B: Scroll back one page
: N: move the cursor to line n.
: $ Move the cursor to the last line
0. move the cursor to the beginning of the row.
$ Position the cursor at the end of the row
G positions the cursor in the last line of this article, which is the same as: $.
H. move the cursor to the top of the screen.
M positions the cursor in the middle of the screen
L move the cursor to the bottom of the screen

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3. Search

/: Search for the following information in the file.
? : Search for the things to be searched in the file.
N: Repeated search forward
N: Repeated search

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4. About Replication

Yy: copy the current row of the cursor
Nyy: copy the n-1 line from the current row to the current row.
: 1,100 co 200 will 1 ~ 100 of the content is copied to 200th rows.
: 100,102 co $ change 100 ~ Copy the contents of the first row to the last row.

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5. About pasting

P: paste it to the next row of the current row.
P (large): paste it to the previous row of the current row

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6. About Delete. Cut

Dd deletes the current row
Ndd is similar to nyy
Dw deletes a word
Similar to ndd, ndw
X delete a character
Nx Delete n characters
DG deletes all content from the current cursor to the end of the file.
D0 deletes all content from the current cursor to the beginning of the line
D $ delete all content from the current cursor to the end of the row
: 1, 100d delete 1 ~ 100
: 100d Delete 100th rows
: 1,100 mo $ Change 1 ~ Move the content of Row 3 to the last row.

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7. insert

I: Enter the insert mode before the characters in the current position
I: insert at the beginning of the current row
A: Enter the insert mode after the characters at the current position
A: insert at the end of the current row.
O: Insert a new row under the current row.
O: Insert a new row on the current row.

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8. About Revocation

U: undo the last change

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9. About replacement

Regexp: The pattern to be matched.
Replacement: string to be replaced

: S/regexp/replacement ------------------------- Replace the first style of the current row
: S/regexp/replacement/g ------------------------- replace all the matches in the current row
: % S/regexp/replacement/g ----------------------- replace all matching styles in the file

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PS: Another important command is the "." command, which is used to repeat the previous command.

In vi, how does one: undo the last operation ?, Repeat a group of Edit operations multiple times ?.......

A) undo the previous edit operation. ====> U
B) Repeat the previous edit operation. ====>.
C) restore the unedited operation. ======> Ctrl + R

D) repeat a group of edits multiple times. ====> "." Command can repeat the last edit action.

Tool: yum install gonme-utils; command: gnome-screenshot-;

The synchronization time can be ntpdate us.pool.ntp.org, which must be networked. If ntpdate is not installed, run yum: yum install-y ntpdate.

Reprinted from: http://www.cnblogs.com/xiaochaohuashengmi/archive/2011/10/14/2211202.html