paul-d-ray

$nu variable

From the Help file about $NU

This is from Nushell 0.110.0 $nu The $nu constant is a record containing several useful values:

• default-config-dir: The directory where the configuration files are stored and read.
• config-path: The path of the main Nushell config file, normally config.nu in the config directory.
• env-path: The optional environment config file, normally env.nu in the config directory.
• history-path: The text or SQLite file storing the command history.
• loginshell-path: The optional config file which runs for login shells, normally login.nu in the config directory.

paul-d-ray

Determine how much was spent on Groceries

I exported the data from MS Money, for all years (2010 + 2025) the details on Grocies.

I wanted to see how to sum the data by year for one grocey store.

I had done this in Visidata, and I knew both Nushell with the Polars plugin and Xan could do it, so I decided how to get the syntax correct in both.

This is a very small dataset, only 1054 records.

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Cable Modems

Motorola SB6120

This was in use from 2011/02 to 2019/10,

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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

paul-d-ray

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

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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

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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.

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# 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

paul-d-ray

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

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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)