Fish friendly interactive shell. Use for terminal shell.
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Added September 2, 2026
ai-agentsrustshellbashdocumentation
Works with
terminal
Security analysis
A100/100
Scanned September 2, 2026
$npx -y skills add majiayu000/claude-skill-registry --skill fish --agent claude-code
Installs into .claude/skills of the current project.
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---
name: fish
description: Fish friendly interactive shell. Use for terminal shell.
---
# Fish (Friendly Interactive Shell)
Fish v4.0 (2025) is rewritten in **Rust**. It is famous for "It just works" – 90% of what you need (autosuggestions, coloring) is enabled by default.
## When to Use
- **Interactive Use**: It is arguably the best shell for _typing_ commands manually.
- **Discoverability**: Man page completions are generated automatically.
## Core Concepts
### Autosuggestions
Fish suggests commands as you type based on history and completions. Right arrow accepts.
### Universal Variables
`set -U my_var value` sets a variable across _all_ current and future shell instances instantly.
### Web Config
`fish_config` launches a browser UI to change colors and prompt.
## Best Practices (2025)
**Do**:
- **Use it as Interactive Shell**: Set it as your login shell.
- **Don't write scripts in Fish**: Write scripts in `bash` or `sh` for portability. Run them _from_ Fish.
- **Use "Fisher"**: The plugin manager for themes.
**Don't**:
- **Don't copy-paste Bash**: Fish syntax is different (`env var=val` -> `set -x var val`).
## References
- [Fish Shell Documentation](https://fishshell.com/docs/current/index.html)
