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# Description Fixes: #13260 When user run a command like this: ```nushell $env.FOO = " New"; $env.BAZ = " New Err"; do -i {nu -n -c 'nu --testbin echo_env FOO; nu --testbin echo_env_stderr BAZ'} | save -a -r save_test_22/log.txt ``` `save` command sinks the output of previous commands' stderr output. I think it should be `stderr`. # User-Facing Changes ```nushell $env.FOO = " New"; $env.BAZ = " New Err"; do -i {nu -n -c 'nu --testbin echo_env FOO; nu --testbin echo_env_stderr BAZ'} | save -a -r save_test_22/log.txt ``` The command will output ` New Err` to stderr. # Tests + Formatting Added 2 cases.
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.