Linux early recognition

1. Virtual Machine usage
[[email protected] desktop]$ rht-vmctl start Desktop (open Desktop virtual machine)
[[email protected] desktop]$ rht-vmctl view Desktop (Show Desktop)
[[email protected] desktop]$ rht-vmctl poweroff Desktop (Close dekstop)
[[email protected] desktop]$ rht-vmctl reset Desktop (reset virtual machine)
Is sure you want to reset desktop? (y/n) Y (asks if reset y means yes)

2. Login
A normal User Login
Student Ordinary user, password student
B Super User Login
->not listed Click Not listed
Username Prompt for user name
->root root for System super User
passwd prompt to enter a password
->redhat Redhat is a super user password

3. Set Chinese input
Applications System Tools Settings region & Language Language
or enter a command

4. Line prompt
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[[email protected] desktop]$
Kiosk (user who opened the shell)
@ (delimiter)
Foundation0 (host name)
Desktop (working directory name)
$ (Identity prompt, #表示超级用户, $ represents a normal user)

5. Switch User
[[email protected] desktop]$ su-username
Advanced user Switch to low-level user does not require a password, Low-level user Switching to advanced or peer switching requires a password, no echo

6. Virtual Console
Ctrl+alt+f (1|7) into graphics
Ctrl+alt+f (2~6) into the Virtual Console
 

7. Version
Red hat Enterprise Linux Server 7.0 (Maipo) # #系统版本
Kernel 3.10.0-123.el7.x86_64 on an x86_64   # #内 Kernel version, number of system bits

8. Execution of the command
A command must be entered after the line prompt
B command format
Command parameter target
C. Command parameter
-parameters    Word abbreviation –h
--parameters   Full spelling of the word--help

9. Help for the command
Whatis command (View command's function)
Command--help (View command's Help)
[]  (opt-in to add-on)
... (Any number of content added)
<>  (content must be added during command execution)

10. Start Bash
1.applications>utilities>terminal
2. Right mouse button----->open in terminal
3.gnome-terminal
4.ctrl+shift+n (open shell in new window)
  ctrl+shift+t ( Open a new tab in the same window)
5. Exit: Exit | ctrl+d

11. System shutdown, restart
Restart
Reboot | Init 6 |shutdown-r now
Shutdown
Poweroff | Init 0 | Shutdown-h now

12. Lock screen
Ctrl + Alt +l       # #在rhel7.0
Win key + l  & nbsp;    # #在rhel7.2

13.date
Watch-n 1 Date (Let the date command execute once per second, CTRL + C launches monitoring mode)

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Date 12180117 (Set the system time to December 18 01:17 format: Every hour of the month)
Date 111811152017.55 (2017 indicates year (can not be added). 55 = seconds (can not be added))

-D +xday-xday (check the time before or after x days)

14.PASSWD Modify User Password
[Email protected] ~]# passwd
New Password: (Enter password)
Retype New password: (Confirm password)
passwd parameter User name
-S student (user password information)
--status student ...
-L Student (lock account)
-U student (Unlocked)
-N 1 student (set password minimum validity period)
-X Student (set password maximum validity period)
-W 3 Student (warning period)
-I 2 student (set user inactive days)
-D student (clear user password)
Monitoring passwd Password Information
Watch-n 1 passwd-s Student
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File name (view file type)

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16. Viewing of files
Cat filename (Displays the full contents of the file)
Less file (paging browse, press "Q" to exit)
Head filename (shows the first few lines of a file)
Head-n 5 filename (former five elements)
Tail filename (shows the file after a few lines)
Tail-n 5 filename (shows the last 5 lines of a file)

17.WC Statistics File capacity information
Wc-l Number of rows
-W Words
-C byte number
-M character Count

18.tab Key
The table key in the system can automatically complement the existing command, the file name and the parameters of some commands

A+tab x2 Show All commands in a system

19.history history
History (show historical)
Hostory-c (clears historical commands in the current environment)
！ Number (execution number of lines command)
！ Letter (Executes the most recent command that starts with this letter)
CTRL +R + keyword (executes the most recent command that contains this keyword)
Up and down keys (line-by-row Invoke command

Shortcut keys in 20.linux
Left and right (one character moves one character)
CTRL + Around (a word moves one word)
CTRL + A (cursor moves to the beginning of the line)
+ E (cursor moves to end of line)
+ U (the cursor position is deleted to the beginning of the row)
+ K (the cursor position is deleted to the end of the line)
+ r+ keyword (bring up the most recent command with a keyword)
+ C (undo to enter the command)
+ d (Close current environment)
+ L (empty screen)
+ SHIFT + C (copy)
+ SHIFT + V (paste)
+ SHIFT + t (reopen a table in the existing shell)
+ SHIFT + N (opens a new shell in the shell)
+ SHIFT + pageup|pagedown (toggle table)
+ ALT + L (lock screen)
+ ALT + up | Down (toggle work interface)
+ ALT + F1|F7 (enter the graphical interface)
+ ALT + F2-F6 (enter Virtual Console)

Today is here, write more coarse, I hope I can master, for tomorrow to write more detailed!

Linux early recognition