Linux basic commands

Date command

1. Command function: The date command can be used to display or set the system's dates and times.

2. Command format: Date [options] ... Format

3. Command parameters:

-D Displays the date and time that the string refers to

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-R Displays the last time the file was modified

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-r displays time in rfc-2822 format

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-S sets the time based on the string

--HELP Display Help information

--version displaying version information

4. Format:

%a Show abbreviated Week

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%A shows the full week

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%b Display Month

%B Show Full Month

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%d which day

%d Full Date m/d/y

%F Full Date y-m-d

%H hours

%m Month

%M Show minutes

5. Time setting

Date S//Set current time, root permission to set

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6.date D Example:

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Date-d "Nov22" This year's November 22 is Wednesday

Date-d ' 2weeks ' 2 weeks after the date

Date-dnext-day+%y%m%d (tomorrow's date) or: date-dtomorrow+%y%m%d

date-dlast-day+%y%m%d (yesterday's date) or: date-dyesterday+%y%m%d

Cal Command:

1. Command function: The CAL command can be used to display the calendar.

2. Command format: cal [parameters] [year | month]

3. Command parameters:

-1 show a single month

-3 shows the first one months, the current month, the next one months

-S displays Sunday for the first day of one weeks

-M displays Monday for the first day of one weeks

-j show the day of the year

-y Displays the calendar for the current year

-V Version Information

4.cal instance:

Displays the current date, showing the last three months, showing 2015 years

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Show today is the day of the Year:

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ls command:

1. Command function: List Directory contents
2. Command format: LS [options] ... File
3. Parameters:

   -A shows all files including hidden files that begin with.

   -A is not displayed. And..

   -l output in long format

   -H in a human-readable way

   -S display file size

   -s sort by file size

4.ls instance:

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Sort by file Size:

PWD command

1. Command function: Displays the current working directory
2. Command format: pwd "Options"
3. Command parameters:

   -l display path (including connection)

   -P shows the actual path

4. Example:

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CD command:

1. Command function: Switch directory
2. Command format: CD [directory name]
3. Instance

   Cd/

   cd/etc/passwd

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Linux basic commands