No, not for unverified migration of critical production workflows, because the README explicitly preserves risks around command stability and design changes.

• The Status section describes the project as having reached only a “minimum-viable-product level of quality” and says that some commands may be unstable even though many people use Nu daily.
• The same section states that Nu’s design is subject to change as it matures, creating ongoing risk for script semantics and command behavior.
• Structured data, functional pipelines, and cross-platform support are stated goals, but those benefits do not imply a production-stability guarantee for every command.
• Project data shows latest release 0.116.1 and five releases, which is insufficient by itself to establish stability for the specific commands, plugins, or platforms required by critical automation.

Yes, because the README directly demonstrates that directories and processes can enter structured pipelines and use the same field-filtering approach.

• ls returns directory records with fields such as name, type, size, and modified; the example filters directories with where type == "dir".
• ps returns a process table, and the example applies where cpu > 0 to a numeric field rather than relying on displayed column positions.
• Nu divides commands into producers, filters, and consumers, with table displaying the result, so the same pipeline shape applies to different system objects.
• The benefit is strongest with Nu built-ins; data from external programs that emit only text still requires unstructured-input handling.

No, not as a drop-in replacement: Nu has different built-ins, variable semantics, argument parsing, and pipeline data models, so existing scripts cannot be assumed compatible.

• The README presents Nu as a structured shell: ls produces table records, where filters fields, and table consumes pipeline output; this is not an equivalent text-stream model.
• Nu can still read and write stdout and stdin and invoke existing executables, but that preserves external-command access rather than Bash or Zsh syntax compatibility.
• The project insight identifies migration risks around variable expansion, conditions, redirection, error handling, paths, and platform commands.
• The README says the project has reached minimum-viable-product quality, while some commands may be unstable and the design may change, so unverified replacement of critical POSIX scripts is unsuitable.

Yes. The README identifies the default configuration source, explains customization, and provides a direct command to locate the active configuration file.

• It says the startup defaults come from sample_config; those files configure Nushell, after which users can customize them for their own needs.
• Configuration is documented as a dedicated capability, and config.nu is explicitly named as the place to customize shell behavior.
• The active configuration path can be queried with $nu.config-path, avoiding assumptions about operating-system-specific locations.
• However, configuration follows Nu’s own semantics, so Bash, Zsh, or PowerShell configuration syntax cannot be assumed to transfer directly.

Yes, especially when CI steps must run across platforms and process structured directory or process data, although external commands still require separate validation.

• The README explicitly treats Windows, macOS, and Linux as first-class platforms and aims for commands and techniques to work across them.
• It provides a dedicated setup-nu path for GitHub Actions, showing that Nu has an installation route for this automation environment.
• ls returns directory records, while ps exposes fields such as pid, name, and cpu; where can be reused for both data sources, reducing column-based text parsing.
• Nu still allows platform-specific executables, so existing CI tools can remain while suitable processing logic moves to structured pipelines.

It depends: Nu is suitable as a cross-platform data-processing layer, but it cannot remove platform differences in external programs.

• The README lists Windows, macOS, and Linux as first-class supported platforms and makes cross-platform behavior the first goal.
• Nu explicitly supports compatibility with existing platform-specific executables, allowing an incremental migration instead of a complete rewrite.
• However, the README does not promise identical arguments, exit codes, path formats, or textual output for every external program on all three platforms.
• Built-in Nu commands produce structured data, while external programs often produce text; crossing that boundary still requires platform-specific parsing and handling.