Linux Notes Collation

Introduction: Linux Philosophy

① All Documents

② Small single-purpose files

③ connecting programs to complete complex programs together

④ avoid confusing user interfaces

⑤ configuration data is stored in text

CentOS File Installation:

Http://mirrors.aliyun.com

Use #md5sun file to derive a value that is consistent with the official release value.

Entry

1. Command structure:

COMMAND OPTION ARGUMENT

Command option Parameters

2. Command prompt

[Email protected] ~]#

Root: User Name

localhost: Host name

~: the current folder; ~ is indicated as the root directory

#: Represented as an administrator user; $ represented as a normal user

3. Command Priority level

Aliases > Internal commands > Cache external > External

4, the Linux variable reference

Reference character name meaning

Any character in single quotation marks as literal meaning

"" in double quotation marks, keep $, ' ', ' function, that is, the translation variable value

' Anti-quote Shell interprets the anti-quote content as a system command

Cases:

1. # echo ' Echo $PATH '

--># Echo $PATH

2, # echo "Echo $PATH"

-->#/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin

3, # echo ' \ \ '

-

#

#echo $ (\ \)

-->bash: \: Command not found ...

#

(PS:"\" is interpreted as an escape character in bash and is used to remove the special meaning of a single character, preserving the literal value of the character following it, in addition to the line break.) )

5. Command

Nano text editing tools

Ctrl+d Login Prompt function

DF Partition Status

Uname Display System Information

Gedit Text Editor

ctrl+alt+f1-6 Character F7 Graphics Centos5

Ctrl+alt+f1 graphic f2-7 character Centos6-。。

CHVT 1-7 Switching interface

StartX graphical interface

Halt power off continuously

Poweroff Power off

Hostname Display host name

Lsb_release Linux Standard Library

Cat/etc/redhat-release Viewing the CentOS configuration

id-u [user name] View user UID

echo $ variable Variable: value

Echo $SHELL

Tar xvf file Extract files

enable-n [command] disable external commands

Date: Displays the system time

Clock: Show Hardware time

Clock-s the system clock, whichever is the hardware clock

-W with system clock, correct hardware clock

Cal: Show Calendar

Nano file:file text Editing

Reset: Reset Desktop Configuration

Create a database

MANBD (CentOS 7)

Makewhatis(CentOS 6)

CENTOS6 Internal Command Help query

Echo: Echoing

In addition to the man Echo, the echo can be used in the Help manual, which also brings back the font color

echo display with color, need to use parameter-E

The format is as follows:

Echo-e "\033[word background color; text color m string \033[0m"

For example:

Echo-e "\033[41;37m Tonyzhang \033[0m"

Where 41 of the position represents the background, 37 of the position is the color of the word

Note:

1, the word background color and the text color is the English "" "

2. There is a m behind the text color

3, before and after the string can have no space, if any, the output is also a space

Here are a few examples:

Echo-e "\033[30m Black character \033[0m"

Echo-e "\033[31m Red word \033[0m"

Echo-e "\033[32m Green word \033[0m"

Echo-e "\033[33m Yellow word \033[0m"

Echo-e "\033[34m Blue word \033[0m"

Echo-e "\033[35m Purple word \033[0m"

Echo-e "\033[36m sky blue Word \033[0m"

Echo-e "\033[37m White character \033[0m"

Echo-e "\033[40;37m Black Bottom White \033[0m"

Echo-e "\033[41;37m Red bottom White \033[0m"

Echo-e "\033[42;37m Green bottom White \033[0m"

Echo-e "\033[43;37m Yellow \033[0m"

Echo-e "\033[44;37m Blue bottom White \033[0m"

Echo-e "\033[45;37m Purple \033[0m"

Echo-e "\033[46;37m sky blue Bottom White \033[0m"

Echo-e "\033[47;30m black character \033[0m on white background"

Control Option Description:

\33[0m Close All Properties

\33[1m Setting High brightness

\33[4m Underline

\33[5m Flashing

\33[7M Reverse Display

\33[8m blanking

\33[30m--\33[37m setting foreground color

\33[40m--\33[47m Set background color

\33[na the cursor to move n rows

\33[NB cursor down n rows

\33[NC cursor right shifts n rows

\33[nd cursor left n rows

\33[Y;XH Setting the cursor position

\33[2J Clear Screen

\33[k clears the contents from the cursor to the end of the line

\33[s Save Cursor position

\33[u Restore cursor Position

\33[?25l Hide Cursor

\33[?25h Display cursor

Echo ' \0nnn ' nnn--and ASCEII code in the corresponding octal code

Linux Notes Collation