Linux Self-study note-Basic command date,cal, etc.

Source: Internet
Author: User

Riding, behind;

Date command:

We can come to man. Date command, which can be seen in the meaning of date-print or set the system date and time, we illustrate the date command from the following aspects.

1. Show Time

Date[option] ... [+format]

format : Format Symbols

%d :

%F :

%T :

Enter a separate date command on the screen to display the system time:

650) this.width=650; "title=" 22f21a8dae6f60a181caf7d1fe569d9.png "src=" Wkiom1mk0syhqdxzaaahojjif8e037.png-wh_500x0-wm_3-wmp_4-s_2786130375.png "alt=" Wkiom1mk0syhqdxzaaahojjif8e037.png-wh_50 "/>

We can also display the time display format we want:

650) this.width=650; "title=" 547f059bf2da0a69dbcbb31bdd93a38.png "src=" Wkiol1mk0ujikctwaaaig-hmqpc844.png-wh_500x0-wm_3-wmp_4-s_3143196561.png "alt=" Wkiol1mk0ujikctwaaaig-hmqpc844.png-wh_50 "/>

2. set the time

Date[-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]]

MM: Month

DD: What date

hh: hours

mm: minutes

YY: Two-bit year

CCYY: four-bit year

. SS: seconds

The following example shows the process of modifying a time using the date command:

650) this.width=650; "title=" Edc687be76d04378871d8ced12dab9a.png "src=" Wkiom1mk0vuamappaaa_dqkm0bq989.png-wh_500x0-wm_3-wmp_4-s_3820756507.png "alt=" wKiom1mK0vuAMappAAA_ Dqkm0bq989.png-wh_50 "/>

Linux Two kinds of clocks

System clock: The timing of the CPU operating frequency by the Linux kernel;

Hardware clock:

Hwclock : Display hardware clock;

- S ,--hctosys


Cal instruction

cal-displays a calendar Show Calendar

1. Show Calendar

Cal [-SMJY13] [[[Day] month] year]

Enter a separate CAL directive on the screen to display the calendar for the current system time Month:

650) this.width=650; "title=" 339456a25983710423015e3917eb498.png "src=" Wkiol1mk0xwiltftaaarn-treyu160.png-wh_500x0-wm_3-wmp_4-s_3184165288.png "alt=" Wkiol1mk0xwiltftaaarn-treyu160.png-wh_50 "/>

You can also display calendars for a full year and any month of any year:

650) this.width=650; "title=" 91e1f34c94421bb6b6b2837c4642591.png "src=" Wkiol1mk0_ucyoxgaaccaqp2r9m203.png-wh_500x0-wm_3-wmp_4-s_1470295419.png "alt=" wKioL1mK0_ Ucyoxgaaccaqp2r9m203.png-wh_50 "/>

650) this.width=650; "title=" C9a20d3a76acbd1edbb8f3a7cfb8e7c.png "src=" Wkiom1mk1cuxssx7aaarg-skxwe977.png-wh_500x0-wm_3-wmp_4-s_3642757702.png "alt=" Wkiom1mk1cuxssx7aaarg-skxwe977.png-wh_50 "/>

Directory Management Class command: CD pwd ls mkdir rmdir tree

mkdir :

mkdir-make Directories Create a directory

mkdir [OPTION] ... DIRECTORY ...

- P : does not error when present, and automatically creates the required directories;

- v : Displays detailed information;

- m MODE : Specify permissions directly when creating a directory

650) this.width=650; "title=" 451d790e909cbe89160df062597f1c1.png "src=" Wkiom1mk1gwjdprsaab_jw03izm195.png-wh_500x0-wm_3-wmp_4-s_3179669606.png "alt=" wKiom1mK1GWjDPrSAAB_ Jw03izm195.png-wh_50 "/>

Tree :

tree-list contents of directories in a tree-like format. The contents of the display directory are in the form of a tree

tree [-ADFGHILNOPQRSTUVXACDFNS] [-llevel [-R]] [-H basehref] [-t title] [-o filename]

[--nolinks] [-P pattern] [-I pattern] [--inodes]  [--device]  [--noreport] [--dirsfirst]

[--version] [--help] [--filelimit #] [Directory ...]

- D : Displays only directories;

- L: Specifies the number of levels displayed;

- P Pattern : Displays only the path that is matched by the specified pattern;

650) this.width=650; "title=" 6fa0854870c370bc503f8ad39267cd6.png "src=" Wkiom1mk1i6jsilfaaahfwjay_y475.png-wh_500x0-wm_3-wmp_4-s_2285354576.png "alt=" wKiom1mK1I6jSiLFAAAhFwJAY_ Y475.png-wh_50 "/>

rmdir :

Rmdir-remove Empty Directories removing an empty directory

rmdir [OPTION] ... DIRECTORY ...

- v : Display Process

650) this.width=650; "title=" 86802184a8b8724b861dba035610229.png "src=" Wkiol1mk1njjlurhaaapfnodsdw684.png-wh_500x0-wm_3-wmp_4-s_4117300075.png "alt=" Wkiol1mk1njjlurhaaapfnodsdw684.png-wh_50 "/>


(1) How to create/tmp/x/y1,/tmp/x/y2,/tmp/x/y1/a,/tmp/x/y1/b,/tmp/x/y2/a,/tmp/x/y2/b

650) this.width=650; "title=" Eafc928a637f1cf6042a11cd9dac337.png "src=" Wkiom1mk1pow5r4qaaauy5khr40365.png-wh_500x0-wm_3-wmp_4-s_4037206398.png "alt=" Wkiom1mk1pow5r4qaaauy5khr40365.png-wh_50 "/>

(2) How to create X_m,y_m, X_n, Y_n

650) this.width=650; "title=" 3303c38330fd4c7080d100e76392640.png "src=" Wkiom1mk1rgrylgsaaagbcba0w8856.png-wh_500x0-wm_3-wmp_4-s_1521819005.png "alt=" Wkiom1mk1rgrylgsaaagbcba0w8856.png-wh_50 "/>

(3) How to create/tmp/bin,/tmp/sbin,/tmp/usr,/tmp/usr/bin,/tmp/usr/sbin

650) this.width=650; "title=" 9a2fc931464186c2c92e4aa80d70cd4.png "src=" Wkiol1mk1spxrpv4aaauzt3jlfs819.png-wh_500x0-wm_3-wmp_4-s_1136934167.png "alt=" Wkiol1mk1spxrpv4aaauzt3jlfs819.png-wh_50 "/>

Linux Self-study note-Basic command date,cal, etc.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.