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Math

Sometimes, you just need to add a few numbers when you're working on a task. Nu offers a set of basic math operations that you can use. Math expressions are available wherever you can call a command.

Add, Subtract, Multiply, Divide

> 1 + 3
4

In Nu, you can do the usual add, subtract, multiply and divide with the operators +, -, *, and / respectively. Operator precedence is respected, so 1 + 2 * 3 will be treated as 1 + (2 * 3). Which leads us to another concept: parentheses.

Parentheses

You can use parentheses to group math expression in math mode. This allows you to write (1 + 2) * 3 if you want the addition to have higher precedence.

in and not-in

You can check if a value is in a set of values or not using the in and not-in operators.

> 1 in [1 2 3]
true

> 1 not-in [1 2 3]
false

=~ and !~

You can check to see if a string is inside of another string, or not inside of another string, using =~ and !~.

> "foobar" =~ "foo"
true

> "foobar" !~ "baz"
true

Comparisons

The following comparisons are also available:

  • < - less than
  • <= - less than or equal to
  • > - greater than
  • >= - greater than or equal to
  • == - equal to
  • != - not equal to

Compound operators

Nushell also supports && and || to join two operations that return boolean values, using 'and' and 'or' respectively. For example: ls | where name in ["one" "two" "three"] && size > 10kb

Order of operations

Math operations are evaluated in the follow order (from highest precedence to lowest):

  • Parentheses (())
  • Multiply (*) and Divide (/) and Power (**)
  • Add (+) and Subtract (-)
> 3 * (1 + 2)
9