paul-d-ray

Sine Wave using Nushell

Sine Wave

# Sine wave ASCII plot in NuShell with color using match (correct syntax for guards)
# written by Grok with some manual syntax corrections and changing the colors to use nushell colors

 const PI = 3.14159265359
 const WIDTH = 180
 const HEIGHT = 30

Nushell's Last vs Last 1 Command

In Nushell, there is a difference between "last" and "last 1"

the "last" command returns a string
the "last 1" command returns a list of strings
the same is true for "first" and "first 1" except the "first 1" is a list of strings (stream)

Nushell Examples

Purpose

Get the SHA256 Hast for a list of files. This can be used to compare to the hast of a downloaded file.

Nushell Code

nuls -f d:/work/tools | where name =~ '^nu'| sort-by modified | select fullname |
each {|file| {fullname: $file.fullname, hash: (open $file.fullname --raw | hash sha256)} } | collect

Merge and aggregate datasets

From Roseeta Code Merge and aggregate datasets Task

Merge and aggregate two datasets as provided in .csv files into a new resulting dataset.
Use the appropriate methods and data structures depending on the programming language.
Use the most common libraries only when built-in functionality is not sufficient.
- Note Either load the data from the .csv files or create the required data structures hard-coded.

VisiData example done in Nushell

This will use the faa-wildlife-strikes.csv file from the VisiData demo. Calculate each species’ state-level percentages

Nushell Code to Join two data sets

let data = open faa-wildlife-strikes.csv
  | where SPECIES !~ 'Unknown' and STATE != ''

let state = $data

Filter on a Date Column

to filer on a date field do the following steps

make sure the import datetime is in the .visidatarc file.
format the date column with @ to let visidata know it is a date column.
be in the column, and do a filter z|
key in the command

    DATE_FIELD_NAME > datetime.date(YYYY,M,D)
    INCIDENT_DATE > datetime.date(2016,1,1)

Visidata Config File

In Windows, the config file goes in the user home folder

Create the C:\Users\USERNAM\.visidatarc file
- note the dot in front of the file name
add the following to the file

# for VisiData
import datetime

options.color_key_col = "green"

Purpose

Use FD to find a file and pipe it to Nushell's ls command to list information on the file.

Nushell Code

fd -H -I -i  -E 'Windows' -E 'Python' -E 'Steel*' -E '*ffice*' -E '*ire*' -E '*VS Code*' -E 'WindowsPowerShell' --glob  '*posh*.exe' 'c:\'  | lines | each {|file|  nuls -f  ($file |path dirname) | where name =~ ($file | path basename )  } | flatten

Nushell Code Explained

fd -H -I -i -E 'Windows' -E 'Python' -E 'Steel*' -E '*ffice*' -E '*ire*' -E '*VS Code*' -E 'WindowsPowerShell' --glob '*posh*.exe' 'c:\'

Using Nushell to get Local Weather

I saw on Hacker News for another programming lanuage. I wanted to get the forecast for my area using Nushell.

I used Grok to get the code for my location.

Nushell Code

http get https://api.weather.gov/gridpoints/FFC/32,107/forecast | from json |
  get properties.periods |

	# config.nu
	#
	# Installed by:
	# version = "0.102.0"
	#
	# This file is used to override default Nushell settings, define
	# (or import) custom commands, or run any other startup tasks.
	# See https://www.nushell.sh/book/configuration.html
	#
	# This file is loaded after env.nu and before login.nu