<h1 align="center">
Welcome to the standard library of `nushell`!
<img src="https://media.giphy.com/media/hvRJCLFzcasrR4ia7z/giphy.gif" width="28"></img>
</h1>
The standard library is a pure-`nushell` collection of custom commands which
provide interactive utilities and building blocks for users writing casual scripts or complex applications.
To see what's here:
```
> use std
> help commands | select name usage | where name =~ "std "
╭────┬─────────────────────────────┬────────────────────────────────────────────────────────────────╮
│ # │ name │ usage │
├────┼─────────────────────────────┼────────────────────────────────────────────────────────────────┤
│ 0 │ std assert │ Universal assert command │
│ 1 │ std assert equal │ Assert $left == $right │
. . .
│ 11 │ std clip │ put the end of a pipe into the system clipboard. │
│ 12 │ std dirs add │ Add one or more directories to the list. │
. . .
├────┼─────────────────────────────┼────────────────────────────────────────────────────────────────┤
│ # │ name │ usage │
╰────┴─────────────────────────────┴────────────────────────────────────────────────────────────────╯
```
## :toolbox: Using the standard library in the REPL or in scripts
All commands in the standard library must be "imported" into the running environment
(the interactive read-execute-print-loop (REPL) or a `.nu` script) using the
[`use`](https://nushell.sh/commands/docs/use.html) command.
You can choose to import the whole module, but then must refer to individual commands with a `std` prefix, e.g:
```nushell
use std
std log debug "Running now"
std assert (1 == 2)
```
Or you can enumerate the specific commands you want to import and invoke them without the `std` prefix.
```nushell
use std ["log debug" assert]
log debug "Running again"
assert (2 == 1)
```
This is probably the form of import you'll want to add to your `env.nu` for interactive use.
## :pencil2: contribute to the standard library
You're invited to contribute to the standard library! See [CONTRIBUTING.md] for details
[CONTRIBUTING.md]: https://github.com/nushell/nushell/blob/main/crates/nu-std/CONTRIBUTING.md