linux Basic principles:
1. A small program consisting of a single purpose, combined with a small program to complete complex tasks
2. All documents
3. Avoid capturing user interfaces as much as possible
4. The configuration file is saved in plain text format
GUI interface
CLI interface:
Command prompt: prompt, bash (shell)
#:root
$: normal user
command:
Command format:
Command options parameters
Options: (Modify command execution mode)
Short options:-< br> Multiple options can be combined:-a -b -c-ab
Long options:--word
Parameters: Object of command
Password:
1, use 4 kinds characters wrongly written characters of at least 3 kinds of
2, long enough, greater than 7 bits
3, use random string
4, Periodic replacement
5, cycle period large enough
Passwad: Change Password
prompt, command prompt [[email protected]~]#
Command:
Magic Number: Magic Numbers (special characters, such as "! ”:#! /bin/bash).
Common Commands 1
Ls
/: Root, view a few file directories
-L: Long format
File type: the
-: Normal file (f)
D: Catalog file
B: Block devices (blocks)
C: Character device file (character)
L: Symbol device files (symbolic link file)
P: Command pipe file (pipe)
S: Socket file (socket)
File permissions: 9-bit, per three-bit set
Each group: rwx (Read, Write, execute) (for example: rw-means can read, can write, cannot be executed)
Number of hard links to files
The owner of the file (ower)
Genus Group of files
File size (size), in bytes
Timestamp (timestamp): The last time the file was modified
Access: Access
Modified: Modify file content changed
Change: Change,metadata metadata, file attributes changed
-H: Do unit conversions
-A: Show hidden files starting with.
. Represents the current directory
.. Represents the parent directory
-A also shows hidden files (but does not contain. and. File
-D: Display the directory's own properties
-I: Displays the index node number of the file (Inode:index node)
-R: Show files in reverse order
-R: Recursive display
Cd:change Directory
CD/A directory, you can switch to that directory
CD does not add any directory, back to home directory (home directory)
CD ~username: Enter the home directory of the specified user
CD-: Switch back and forth between the current directory and the previous directory
This article is from the "11160930" blog, please be sure to keep this source http://11170930.blog.51cto.com/11160930/1739698
2016-1-29 Linux Basic Learning 1