Brother Bird's private dish Linux video Tutorial Learning notes (Episode I)

1th: How commands are executed online help shutdown

ls command: Lists the files of the current directory, equivalent to the Dir under DOS

Date command: Displays the current date and time only the date: Date +%y-%m-%d only look at time: Date +%h:%m

The command line is too long to handle:

No newline: (View profile) Vi/etc/sysconfig/network-scripts/ifcfg-eth0

Case of line break: Vi/etc/sysconfig/network-\ Scripts/ifcfg-eth0

Cal Command: Displays the Calendar command format for the current month: Cal [month] [year]

If the year-round calendar is displayed, enter: Cal: Cal 2014

BC Command: Calculation software (computable subtraction and modulo arithmetic and exponential operation) input BC ENTER

Use scale to specify the number of digits after the decimal point for the result to be displayed, such as: scale=3 1/3 shows the result as:. 333

Enter quit to quit BC software

Important hotkeys: Tab CTRL + C CTRL+D

tab is after the first word of a string of commands, or command completion

tab is followed by the second word of a string of commands, then "file is padded"

CTRL + C If you enter the wrong command or parameter, causing the command or program to run continuously under the system, press CTRL + C to interrupt the current command or program

Ctrl+d means that the keyboard input ends EOF or end of input (input end), which can replace the input of exit

Clear command: Clear the screen

Cat command: View file contents

At the command line, you can output all the commands by pressing the TAB key directly without losing any parameters.

Man page meaning of common numbers

1 commands or executables that a user can manipulate

2 functions and tools that can be called by the system core

3 Some common functions and library functions

4 description of the device file

5 format of the settings file or some files

6 games

7 conventions and protocols, such as Linux standard file system, network protocol and other content

8 Administrative commands available to system administrators

9 Kernel-related files

Part of the man page

Name short command, data name description

Synopsis Brief Command syntax (syntax) introduction

DESCRIPTION a more complete description

OPTIONS for the Synopsis section, the example shows all available parameters

COMMANDS commands that can be issued in this program when the program is executed

Files This program or data is used, referenced, or connected to some file

See ALSO Other reference notes related to this command or data

EXAMPLE Some reference examples BUGS if there are related errors

Common parameters for command shutdown for shutdown

-T sec:-t plus seconds, indicating shutdown in a few seconds

-K: Don't really shut down, just send a warning message out

-R: Reboot after the system service has been stopped

-H: Shut down the system immediately after the service is stopped

-N: Shut down directly with shutdown function without the INIT program (initialization program)

-F: A disk check that forces a bypass of fsck after shutting down and powering on

-F: Force a disk check for fsck after the system reboots

-C: Cancels the contents of the shutdown instruction already in progress

such as: Shutdown-h 23:00 designated at 23:00 shutdown

Shutdown-r now restart

Other similar commands:

Reboot and Shutdown-r now are almost identical.

Halt

Poweroff

Before executing these commands, it is best to perform a few more sync to write the contents of the memory to disk

Brother Bird's private dish Linux video Tutorial Learning notes (Episode I)