Common Commands under Linux

ls:

is to display the file in the current directory

LL:

is to display the file details in the current directory.

Description of the file attributes:

There are a total of file attribute fields Ten A letter composition ,

The first letter indicates the type of file,If the letter is a minus sign"-",indicates that the file is a regular file.Letters"D"indicates that the file is a directory,Letters"D",is aDirtectory (Catalogue)the abbreviation.Please note,A directory or a folder is a special file.,This special file holds information about other files and folders..If the letter is"L",indicates that the file is a symbolic link.The concept of symbolic links is similar toWindowsshortcut in the.

after the first field 9 A letter representing the permissions of the file .

the first three of them represent the permissions of the file owner , Middle Three represents group user rights , The last three represent other user rights .

R table is read (Read) W represents writing (Write) x represents the execution (EXecute)

Useradd:

Useradd – G sales Jack – G company,employees//-g : Join the main group, - G : Join a secondary group

• Groupadd
  

  as : Groupadd dba

• Wget

Download the file at the specified address

such as: wget http://download.redis.io/releases/redis-2.8.3.tar.gz

Tar

Extract
Syntax: tar [main option + Secondary options] file or directory

When you use this command, the main option is required, and it tells Tar What to do, auxiliary option is auxiliary use, can choose.

Main options:

C create a new profile. Select this option if the user wants to back up a directory or some files. Equivalent to packaging.

x release the file from the archive file. Equivalent to unpacking.

T List The contents of the archive file to see which files have been backed up.

in particular, in the release of parameters, c/x/t only one can exist! Cannot exist at the same time! Because it is not possible to compress and decompress simultaneously.

Accessibility Options:

- Z : Do you have both gzip 's properties? i.e. do I need to compress or decompress with gzip? The general format is xx.tar.gz or xx. tgz

-j : Do you have both bzip2 's properties? i.e. do I need to compress or decompress with bzip2? The general format is xx.tar.bz2

- v : Files are displayed during the compression process! This common

- F : Using the file name, please note that the F then you need to pick up the file name now! Don't add any more parameters!

- P : Use original properties of original file (attributes will not change according to user)

--exclude FILE : In the process of compression, do not use the FILE Pack it Up!

Such as:

Tar-xzf redis-2.8.3.tar.gz decompression

tar-cvf/tmp/etc.tar/etc <== package only, do not compress!
Tar-czvf/tmp/etc.tar.gz/etc <== after packing, compress with gzip

tar-cjvf/tmp/etc.tar.bz2/etc <== after packaging, to bzip2 Compression

Make

Compile

Mkdir
Create a Directory

mkdir –p If the parent directory does not exist , establish the parent directory.

Rm

Delete file (clip)

RM-RF Catalog Name
- R is recursive down, no matter how many levels of directory, delete
- F is to directly forcibly delete, do not make any hint of meaning

Touch

Creates a new file.

Chown

Use The chown command modifies the user to which the file or directory belongs:

command: Chown User directory or file name

For example: chown qq/home/qq ( The owner of the QQ directory under the home directory changed to QQ User )

Chgrp

Use The CHGRP command modifies the group to which the file or directory belongs:

command: chgrp Group directory or file name

For example: chgrp qq/home/qq ( the home directory of the QQ directory belongs to the group to QQ Group )

How to execute the program:

1. if There is a directory of your program in path, execute filename directly 2. if There is no directory for the program in path, enter the directory ./filename or Path/filename

Telnet

[[Email protected] redis]$ telnet 127.0.0.1 6379

Trying 127.0.0.1 ...

Telnet:connect to address 127.0.0.1:connection refused – connection failure

[[Email protected] redis]$ telnet 127.0.0.1 6379

Trying 127.0.0.1 ...

Connected to 127.0.0.1.

Escape character is ' ^] '. -The presence of this represents a successful connection.

Quit-Enter quit to quit

+ok

Connection closed by foreign host.

Cp

File copies such as:

CP redis.conf/etc/redis.conf

Ps

View process

Such as:

[Email protected] etc]$ Ps-ef | grep Redis

Root 4122 1854 0 09:57? 00:00:00 Sshd:redis [Priv]

Redis 4126 4122 0 09:57? 00:00:00 sshd: [Email protected]/0

Redis 4128 4126 0 09:57 pts/0 00:00:00-bash

Root 6138 6077 0 10:03 pts/0 00:00:00 su redis

Redis 6139 6138 0 10:03 pts/0 00:00:00 bash

Root 6293 6184 0 10:11 pts/0 00:00:00 su redis

Redis 6294 6293 0 10:11 pts/0 00:00:00 bash

Redis 6536 1 0 10:27? 00:00:00 redis-server *:6379

Redis 6548 6294 0 10:28 pts/0 00:00:00 ps-ef

Redis 6549 6294 0 10:28 pts/0 00:00:00 grep--color=auto Redis

netstat

View ports

Such as:

--6379 is a Redis Port number

[Email protected] etc]$ Netstat-nap | grep 6379

(Not all processes could is identified, non-owned process info

Would is not being shown, you would has to be the root to see it all.)

TCP 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 6536/redis-server *

TCP6 0 0::: 6379:::* LISTEN 6536/redis-server *

--6536 is to use PS Check to see Redis Process ID

[Email protected] etc]$ Netstat-nap | grep 6536

(Not all processes could is identified, non-owned process info

Would is not being shown, you would has to be the root to see it all.)

TCP 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 6536/redis-server *

TCP6 0 0::: 6379:::* LISTEN 6536/redis-server *

View All ports

[Email protected] etc]$ netstat-a

Vi

Enter VI file name into VI command mode

Enter I enter edit mode to change and press ESC to exit

Then, this is the command mode, the command is as follows:

: W Save

: Q exit

: Wq Save and exit

: wq! File owner ignores file's read-only attribute save directly and exit

Kill

Kill-2 : Features similar to Ctrl + C is that the program can save the relevant data before it is finished, and then exit.

Kill-9 : Directly force the end of the program.

Common Commands under Linux