Linux none of this can be graceful and shy of the sister said: "Open, let me come!" "(The day of Linux to take you to fly the article (beginning))

1.shutdown
Common commands:
(1) Shutdown-h 1--One minute shutdown
(2) Shutdown-h now--shutdown
(3) Shutdown-h 15:30--set at a certain time to shut down the machine
Details: Shutdown-r 2--the system starts in two minutes

2.poweroff command:
Poweroff---power off immediately
3. Halt---Suspend system
4. Reboot------Restart the system

5.***---init command----* * *
init [0-Stop, 1-single-user mode, 2-multiuser mode]
[3-Full multiuser mode, 4-unallocated use, 5-graphical interface, 6-reboot]
When we forget the root command, we switch the system to single-user mode,
Then reset the root user password.

6. Find a software that we have installed.
Rpm-aq | grep gcc--check if we have the GCC software installed
Rpm-aq--List all installed software
Add a channel to further constrain the query condition.

7. For a small problem:
How to save a content, edit to a file.
For example Netstate-an >>gxjun.txt use >> for append and use > for overlay

8. For the < and << of the two operations, there is a similar difference between the same,

9. Usage of CD:
(1): Cd/home---absolute path
(2): CD. /etc---relative paths

10: ~ Represents the home directory of the current user, so
[[Email protected] etc]# CD ~--Home Directory
One. LS--View file List command
PWD View your current directory
A. Touch creates an empty file
Touch [option/path] filename
Touch Gxjun--Create a file named Gxjun.
-----------------------Modify the timestamp-----------------------------
sh-4.1# touch-d "10/12/10 21:20" Gxjun
sh-4.1# ls-l Gxjun
-rw-r--r--. 1 root root 0 Oct Gxjun

mkdir---Create a directory
MV Res Dec---move a file
15. view file type filename
sh-4.1# file Gxjun
Gxjun:empty
16: When we want to see the content of a file, there are generally two ways.
Method One: VI gxijun.txt use VI to open, and then view.
Method Two: The cat gxjun.txt is displayed directly on the black and white panel.
The role of the tail command is to start viewing the text from the last line of text.

[[email protected] ~]# TAIL-2 Gxjun.txt---View the contents of the last two lines of Gxjun.txt
UNIX 3 [] Dgram 9115
UNIX 3 [] Dgram 9114

More commands are often used to view long files.
[Email protected] ~]# more Gxjun.txt
At the same time: less

WC--Text Statistics command "Number of lines, number of words, bytes, and filename"
20. Some basic commands about time
(1). [[Email protected] ~]# date + "%F%T"
2015-03-15 10:49:09
(2). [[email protected] ~]# cal
March 2015
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31
(3).
Note: The CAL command looks at the specified year or month, such as viewing the February 2009 calendar
[[email protected] ~]# Cal 2 2009
February 2009
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
21. It is important to note that:
Linux has two clocks, and the first clock is the system's own system. The second type is hardware system.
22.who---View users in the current system
[email protected] ~]# who
Root Tty1 2015-03-06 09:25
Root pts/0 2015-03-15 10:26 (192.168.0.112)
Finger--command to view users logged into the system and related information,
A. W---see who is using the system.
[Email protected] ~]# W
10:59:19 up 9 days, Min, 2 users, Load average:0.00, 0.00, 0.00
USER TTY from [email protected] IDLE jcpu PCPU
Root tty1-06mar15 12:57m 0.13s 0.03s Bash
Root pts/0 192.168.0.112 10:26 0.00s 0.24s 0.04s W
Wall---Send announcements to all online users.

[Email protected] ~]# Wall Hello world!!
Wall Hello Worldclear

Broadcast message from [email protected] (pts/0) (Sun Mar 15 11:02:09 2015):

Hello Worldclear
The. Write---Send messages to other users, including root. "CTRL + c---Exit even if message mode"
MESG [n/y]---The command is to reject the message or accept the message.
Fuser--Disconnecting user commands Fuser

Linux none of this can be graceful and shy of the sister said: "Open, let me come!" "(The day of Linux to take you to fly the article (beginning))