How to find out interesting and useful things when at the Linux command prompt.

Find out what day Easter is? Use this useful command.

ubuntu ~ $ ncal -e
March 27 2016

Display the date of Easter for Greek and Russian Orthodox Churches.

ubuntu ~ $ ncal -o
May  1 2016

Find out how much disk space is left on your / partition.

ubuntu ~ $ df -Hla /
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       32G   26G  5.1G  84% /

Get the weather for Montreal Canada with the finger command.

ubuntu ~ $ finger montreal@graph.no
                   -= Meteogram for canada/quebec/montreal =-
 'C                                                                   Rain (mm)
 25               =-----
 24
 23            =--      ---
 22^^^                                    ---
 21                                    ^^^
 20     |   ===                                     5 mm
 19   ==|                  =--               ---    4 mm
 18     |===                  ---   =--             3 mm
 17     |  |                                        2 mm
 16     |  |  |                  ---                1 mm
    23 02 05_08_11_14_17 20 23 02 05_08_11_14_17 20 Hour
 
    SW SE SE SW SW SW SW SW SW SW SW SW  W NW NW NW Wind dir.
     3  2  2  4  7  7  7  6  4  4  4  5  6  6  6  5 Wind(mps)
 
Legend left axis:   - Sunny   ^ Scattered   = Clouded   =V= Thunder   # Fog
Legend right axis:  | Rain    ! Sleet       * Snow
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Get a shorter forecast like this.

ubuntu ~ $ finger o:montreal@graph.no
montreal at 23:00: 22 C, 3.4 mps wind from SSW.

The user may also substitute other cities to get information about where they live.

ubuntu ~ $ finger sydney@graph.no
              -= Meteogram for australia/new_south_wales/sydney =-
 'C                                                                   Rain (mm)
 18                         12                     10 mm
 17---                       |                      9 mm
 16   ^^^                  ==|                      8 mm
 15                     ===  |======  |  |          7 mm
 14      =--                 |        |  |      === 6 mm
 13         ===              |  |   ==|  |     |    5 mm
 12            =========     |  |  |  |==|==|  |    4 mm
 11                    |     |  |  |  |  |  |==|  | 3 mm
 10              |     |     |  |  |  |  |  |  |  | 2 mm
  9           |  |  |  |  |  |  |  |  |  |  |  |  | 1 mm
   _13 16 19 22 01 04_07_10_13 16 19 22 01 04_07_10 Hour
 
     S SW  S SW SW SW SW SE  S  E  E NE SE NW NW  E Wind dir.
     4  4  6  5  3  3  2  3  4  4  4  1  1  1  1  2 Wind(mps)
 
Legend left axis:   - Sunny   ^ Scattered   = Clouded   =V= Thunder   # Fog
Legend right axis:  | Rain    ! Sleet       * Snow
[Rate limited to survive twitter storm. Max 3 connections pr. 30 seconds.]

Get the battery status of your laptop from the command line with a simple utility.

Firstly, install the acpi utility.

ubuntu ~ $ sudo apt-get install acpi

Then just execute the acpi command to get battery information.

Another way to get the system hostname.

jason@jason-virtual-machine ~ $ /sbin/sysctl kernel.hostname | sed -n -e 's/^.*= //p'

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