Shulou(Shulou.com)06/02 Report--

Introduction to Cloud Computing Development course: Linux heavy vi Editor:

Create an exercise file

[root@tianyun ~] # ll-a > list.txt

File Editor gedit

File editors vi, vim, nano

Vi editor working mode

Command mode:

a. Cursor positioning

Hjkl

0 $

Gg G

3G enters the third line

/ string (n N can be cycled) quickly navigate to a line

/ ^ d

/ txt$

b. Text editing (a small amount)

Copy yy 3yy ygg yG (in behavior units)

D Delete dd 3dd dgg dG (in behavior units)

P paste

X Delete the character where the cursor is located

D delete from the cursor to the end of the line

U undo undo

^ r redo redo

R can be used to modify a character

c. Enter other modes

An enter insert mode

I enter insert mode

O enter insert mode

An enters insert mode

: enter the last line mode (extended command mode)

V enter visual mode

^ v enters visual block mode

V enters visual line mode

R enters replacement mode

Insert mode:

^ P

Visual block mode:

Block insert (character before specified block): select block, I insert character before block, ESC

Block replacement: select the block, r enter the character to replace

Block deletion: select block, d | x

Block copy: select block, y

Extended command mode:

a. Save exit

: 10 enter line 10

W save

Q exit

Wq saves and exits

: w! Forced save

: q! Do not save and exit

: wq! Force save exit

: X Save and exit ZZ

b. Find and replace

: range s/old/new/ option

: 1 s/root/yang/ 5 s/root/yang/ replaced by yang from 1 mi 5 lines of root

: 5 s/root/yang/ $represents the last line

: 1 s/root/yang/g $s/root/yang/g =:% s/root/yang/g% for full text g for global

:% s#/dev/sda#/var/ccc#g

:, 8 s/root/yang/ from the current line to line 8

4 replace the first # of line 9 / ^ # / 4-9 with a blank

Add # characters (. * whole line & reference lookup content) before 5-10.

c. Read / write file (save as)

W save to the current file

W / tmp/aaa.txt Save as / tmp/aaa.txt

: 1,3 w / tmp/2.txt

R / etc/hosts after reading the file to the current line

: 5 r / etc/hosts after reading the file to line 5

d. Set up the environment

Temporary settings:

: set nu sets the line number

Set ic is not case sensitive

: set ai automatic indentation

Set list display control character

: set nonu unsets the line number

: set noic

Permanent environment: modifying vim environment configuration fil

/ etc/vimrc affects all system users

~ / .vimrc affects a certain user

# vim ~ / .vimrc

Set ic

Set nu

Delete must use relative path, do not use absolute path

# vim-O / etc/hosts / etc/hostname ^ ww switch

# cp / etc/hosts hosts1

# vimdiff / etc/hosts hosts1

=

Create a file

[root@localhost ~] # touch aa.txt

[root@localhost ~] # touch aa.txt cc.txt tt.txt

[root@localhost ~] # touch abc {1.. 10} .txt

[root@localhost ~] # touch {areco bje c} {1.. 3} .txt

Create a directory

[root@localhost ~] # mkdir abc

[root@localhost ~] # mkdir abcd abce abcf

[root@localhost ~] # mkdir abc {1.. 5}

[root@localhost] # mkdir-p / root/aa/cc

[root@localhost] # mkdir-pv / root/aa/cc-p Recursive-v display process

Copy cp

Cp source file address destination address

[root@localhost ~] # cp / root/abc1.txt / tmp/

[root@localhost ~] # cp / root/abc1.txt / tmp/test.txt renaming during replication

Copy directory

[root@localhost] # cp-r / root/abcd/ / tmp/

[root@localhost ~] # cp-r / root/abcd/ / tmp/aaa rename

Cut mv

Cp source file address destination address

[root@localhost ~] # mv / root/tt.txt / tmp/

[root@localhost ~] # mv / root/tt.txt / tmp/back.txt

Move directory

[root@localhost ~] # mv / root/abcf/ / tmp/

[root@localhost ~] # mv / root/abcf/ / tmp/back

Delete rm rmdir

Rmdir can only delete empty directories

Rm

[root@localhost ~] # rm aa.txt

[root@localhost] # rm-f cc.txt

[root@localhost ~] # rm-rf abce/

[root@localhost ~] # rm-rf a1.txt a2.txt

[root@localhost] # rm-rf * .txt

[root@localhost ~] # rm-rf abc*

[root@localhost] # rm-rf *

[root@localhost ~] # rm-rf / install.log

View the contents of the file

Head

[root@localhost ~] # head / root/install.log

[root@localhost ~] # head-n 20 / root/install.log

[root@localhost] # head-20 / root/install.log

Tail

[root@localhost ~] # tail / root/install.log

[root@localhost] # tail-20 / root/install.log

[root@localhost ~] # tail-f / var/log/messages Monitoring Log File

More

[root@localhost ~] # more / root/install.log

The space goes back one page, enter back, b, forward.

Less

[root@localhost ~] # less / root/install.log

Cat

[root@localhost] # cat-n / root/install.log

[root@localhost ~] # cat-n aa.txt all lines

[root@localhost ~] # cat-b aa.txt valid line

[root@localhost ~] # cat-n / root/install.log | less

Exercise:

1. Create the following directory structure? And verify it? (an order?)

/ aa

/\

Bb/ bc/

/\\

Ca/ cb/ cc/

[root@localhost ftp] # mkdir-pv / aa/bb/c {ajar b} / aa/bb/cc

[root@localhost ftp] # mkdir-pv / aa/b {bplink c {a, b}, c/cc}

[root@localhost ftp] # ls-R / aa/

[root@localhost ftp] # tree / aa

/ aa

├── bb

│ ├── ca

│ └── cb

└── bc

└── cc

[root@localhost ftp] # tree-L 2 /-L level

two。 When / etc/man.config is copied to the ca directory (in two ways) the current directory /

[root@localhost ~] # cp / etc/man.config / aa/bb/ca/

[root@localhost /] # cp etc/man.config / aa/bb/ca/

3. Move the man.config under ca to the cc directory and rename it to test.txt (2) current directory bb

[root@localhost bb] # mv / aa/bb/ca/man.config / aa/bc/cc/test.txt

[root@localhost bb] # mv ca/man.config / aa/bc/cc/test.txt

4. Copy the same file to the same directory twice without an overwrite prompt

[root@localhost] #\ cp / root/install.log / tmp/

[root@localhost bb] # / bin/cp / root/install.log / tmp/install.log

[root@localhost bb] # unalias cp

[root@localhost bb] # cp / root/install.log / tmp/install.log

5. Show only line 1001 of the / root/install.log file

[root@localhost bb] # cat-n / root/install.log | head-1001 | tail-1

VIM text editor

Three basic modes of vim: command mode, input mode, and last line mode

Switch from command mode to input mode:

An enter after the current character

An input at the end of the current line

I enter before the current character

I current line header input

O input on the next line of the current line

O input on the previous line of the current line

S enter after deleting the current character

S enter after deleting the current line

In command mode

U undo one-step operation

Ctrl+r redo

Copy a line of yy paste p

Copy 50 lines of 50yy

Cut / delete a row of dd

Cut / delete 50 lines of 50dd

The beginning of the line

$end of line

D ^ Delete the current character to the beginning of the line

D $removes the current character to the end of the line

Y ^

Y $

Replace

: s/ab/**/ replaces the first string to which the current line matches

: s/ab/**/g replaces all matching strings on the current line s replaces g global

4. Open the new tab ctrl+shift+t alt+1. Toggle label ctrl+shift+w close tag ctrl+shift+q close all terminals

# commands are saved under bin

There are two ways to use Shell:

Inefficient input commands are suitable for a small amount of work

Shell Script (script) is efficient and suitable for complex and repetitive tasks.

Pwd displays the current full directory

# indicates that we are currently using a super account

$indicates that we are currently using an ordinary account

Long hostname: zhuangyao.baidu.com

Enter bash command considerations:

Enter the command:

# Command [option] parameter operator

# ls

All commands must be followed by spaces (the number of spaces is not online)

Tab: automatic completion

The reason why it is not completed: the command is miswritten and has no executable permission.

Ctrl+c: interrupts the current input

Common shortcut keys:

Ctrl + c: terminate the command

Ctrl + up and down: move by word

Move to the beginning of the command line home

Move to the end of the command line end

Thinking questions:

Delete from the cursor to the beginning of the command line

Delete from cursor to the end of the command line

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