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# Description This extends the documentation on the commands `open` and `save` can run under the hood, and explicitly lists those, based on the current user environment. Also see [this discord thread](https://discord.com/channels/601130461678272522/988303282931912704/1364930487092777020) # User-Facing Changes Users will be able to see the list of commands that `open` and `save` can run, and the extensions that each command is run for, in `help open` and `help save` respectively: ## `help open`  ## `help save`  # Tests + Formatting All pass except for the ones that don't (and never did pass for me before). # After Submitting No updates needed.
Welcome to the standard library of `nushell`!
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
> scope commands | select name description | where name =~ "std "
#┬───────────name────────────┬───────────────────description───────────────────
0│std assert │Universal assert command
1│std assert equal │Assert $left == $right
2│std assert error │Assert that executing the code generates an error
3│std assert greater │Assert $left > $right
4│std assert greater or equal│Assert $left >= $right
... ...
─┴───────────────────────────┴─────────────────────────────────────────────────
🧰 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 command.
You can choose to import the whole module, but then must refer to individual commands with a std prefix, e.g:
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.
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.
✏️ contribute to the standard library
You're invited to contribute to the standard library! See CONTRIBUTING.md for details