Linux common commands and Detailed

Linux common commands and Detailed

Delete files in the Linux system, create, change and other operations are to complete the operation we want through a different command, command what is it?

Able to complete certain tasks and operations of the input string all the characters in the user interface can be called in command. Strictly speaking, the name of the command usually represent a certain type of program instructions or implement functions.

Here we come to understand the classification system Linux commands what? The composition of the command line format What? Frequently used commands what?

Classification Linux commands

Internal command

Internal command means integrated inside special command interpreter program Shell, also referred to as a built-in command. Internal commands without having to re-read the file from the hard disk, so a higher efficiency.

External command

External command means in the Linux operating system can complete binary script file or a particular function, each external command corresponding to a file system, is part of the command interpreter program outside of the Shell, so called external command. Linux operating system must know the location of the external command file corresponding to be able to be loaded and executed by Shell.

Linux system command line format

Linux System Command Format

Command word [options] [parameters].

Is the name of the command word command: Command word

Options: At a command word followed by a single character or multiple characters, each representing a function

Parameters: command word processed, the command parameters typically may be a file name, path name or user name etc.

Linux auxiliary command

hot key	effect
TAB	Autocompletion
Backslash "\"	Force a line break
CTRL+U	To empty the beginning of the line
CTRL+K	Clear lines to
CTRL+L	Clear screen
CTRL+C	Interrupt

[Root @ localhost ~] # Comments

root: the current system login user

localhost: hostname

bin: Current location

#: Administrator

~: That home directory

cd command

cd: switching paths command

Command word	Options	effect
cd	“/”	Into the root directory
cd	“..”	Return to the previous
cd	"./" or "."	Current path
cd	“-”	Switching path to the last execution path cd

Get command help

help command

--help option

man Manual

Linux system commonly used commands

ls command

Command word	Options	effect
ls	-l	Show file
ls	-h	The unit displays the file size, this option requires a combination of "-l" option is used with
ls	-a	Show hidden files
ls	-A	Show hidden files, but does not display "." ".." two special hidden directory
ls	-R	(Recursive)
ls	-i	View file node (Serial Number)

pwd command

Command word	effect
Pwd	Display the working directory of the user's current location

du command

Command word	Options	effect
of	-ah	Statistics include disk space occupied by all files, not just statistics directory.
of	-sh	Only counts the total amount of space occupied by each parameter.

makdir command

Command word	Options	effect
mkdir		Create a directory
mkdir	-p	Creating nesting

Create a file command

Command word	effect
touch	Create a file (empty files)
echo	Create a file to create the file contents
vim	You can create file and enter edit content

ln command

Command word	Options	effect
ln		Chong key hard-wired file
ln	-s	Create a soft link file

-	Soft links (also known as symbolic links)	Hard-wired
After you delete the original file	Fail	Still available
Use of	Use a file or directory in	Only available for file
Save location	The original file can be located in different file systems	It must be the same as the original file in the file system (into a Linux partition) within

cp command

Command word	Options	effect
cp	-f	Enforcement (copy)
cp	-i	It will remind coverage
cp	-p	Reserved rights to copy unchanged
cp	-r	He expressed recursively, copying all the files and subdirectories

rm command

Command word	Options	effect
Rm	-f	Not remind deleted
Rm	-i	It will remind Delete
Rm	-r	Recursive delete
Rm	-rf	Remove completely

mv command

Moving files or directories (cut and paste, rename indicates when moving the original directory)

which command

Find command file / file storage directory (which is able to distinguish between external command), the search range is determined by the PATH environment variable.

Location range specified command file system to identify where: environment variables (the PATH)

find command

Find Data File command (in order to find the range and achieve multiple lookup)

format

find [Look] [Find conditional expression]