Linux Basics Getting Started command

First, Basic view command

1. View CPU hardware information: LSCPU

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2. Check memory usage: free-h

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3. View disk partition: Fdisk–l

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4. View disk usage: df–h

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5. View MD5 value of ISO image file: md5sum

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6. Display full hostname: hostname

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7. View IP Address: ifconfig or IP addrlist

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8. View Linux version: Cat/etc/centos-release or Cat/etc/redhat-release

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9. View Linux System kernel version: Uname–r

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10. Check the system time: Date

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Set the system time format: Date [-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]]

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Show UTC Time: Date–u

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Display a specific time format in +% form: Date +%f

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11. Check the system hardware clock:

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Calibrate the system clock with the hardware clock: clock–s

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Calibration of hardware clock with system clock: clock–w

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12. View Calendar: Cal

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View a year's calendar: cal+ year

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To view a calendar for a year: Cal+ month + year

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13. View System login User: Who

View current logged in User: WhoAmI

View current user and login terminal: Who am I

View the currently logged-on endpoint: TTY

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14. See if a command is internal or external: Type+command

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Internal commands can display Help information using Help+command, while external commands need to display help with Command–help

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To view environment variables for external commands: Echo $PATH

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To view external commands loaded into memory: hash

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Hash–d command: Remove an external command that is loaded into memory

Hash–r: Clears all external commands that are loaded into memory

Note: Internal commands in bash take precedence over external commands, and external commands loaded into memory take precedence over external commands in environment variables. If there is a command to set the alias, then the command of the alias takes precedence over the internal command.

15. View the absolute path of a command: which

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16. View the absolute path of a command and the path to the Help document: Whereis

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17. See a simple help for a command: Whatis or man-f

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18. View Historical commands: History

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History Command Common parameter description:

-C: Empty command history

-D: Delete the specified command history

-r: Read command history from file to History list

-W: Append commands from the history list to the history file

history#: Show the most recent # command

Call the commands in the history list:

!#: Once again execute the # command in the History list

!! : Executes the previous command again

Commands that are run after the system shuts down are saved in the. bash_histry file in the home directory

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Second, the use of simple shortcut keys

1. Switch between GUI and text interface

In CentOS6 or CentOS7:

Ctrl+alt+f1 graphical interface

Ctrl+alt+f2-f6 Text Interface

In CentOS5:

Ctrl+alt+f1-f6 Text Interface

Ctrl+alt+f7 graphical interface

2. Bash shortcut keys

Ctrl+l: Clear screen, equivalent to clear command

CTRL + C: Canceling execution of commands

CTRL + A: Move to the front of the command line

Ctrl+e: Move to the last side of the command line

Ctrl+u: Delete to the beginning of the line

Ctrl+k: Delete to end of line

3. Shortcut keys in Gnome graphical interface

Ctrl+shift+n: Create a new terminal

Ctrl+shift+t: Create a new tab page

CTRL+SHIFT+Q: Close a terminal

CTRL+SHIFT+W: Close a tab

Ctrl+pgup/pgun: Switch to the next or previous tab

This article is from the "Linux Operational Learning path" blog, please be sure to keep this source http://fengliang.blog.51cto.com/3453935/1829583

Linux Basics Getting Started command