Did You Know? man is the Linux’s manual pager. Each page argument given to man is normally the name of a program, utility or function. The manual page associated with each of these arguments is then found and displayed. A section, if provided, will direct man to look only in that section of the manual. The default action is to search in all of the available sections, following a pre-defined order and to show only the first page found, even if page exists in several sections.

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date

Article Index
1. Name
2. Synopsis
3. Frequently used options
4. Examples

1. Name

date [man page] - print or set the system date and time

2. Synopsis

date [OPTION]... [+FORMAT]
date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

3. Frequently used options

-u, --utc, --universal
      print or set Coordinated Universal Time
+%F     full date; same as %Y-%m-%d

4. Examples

date command is used to set up and display time. By typing date command without any options and arguments date displays current time:

$ date

date command can also be used to set time. However this require superuser permissions. To set time to 20th March 2010 23:45:28 we can use command:

# date 032023452010.28

Date command is often used with connection to bash scripting for example to create simple backup scripts:

#!/bin/bash
OF=myhome_directory_$(date +%Y%m%d).tar.gz
tar -czf $OF /home/linuxconfig

Or we can do something like this:

$ echo "Today is `date +%A` `date +%e`th of `date +%B` `date +%G` which is \
`date +%j`th day since 1th of January `date +%G`"

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