Fish Shell

Fish, fish-lsp or rust-analyzer?

The shell and the language server are different projects. Fish 4.0 moved the shell’s C++ implementation to Rust; that does not make its scripts, supporting tools or editor integrations Rust programs. Read the Fish team’s account of the port.

• Want an interactive shell? Use Fish for running commands, with built-in autosuggestions and tab completion. After installing it, try a session by running fish; use exit to return to your previous shell. You do not need to change your login shell for this trial. Fish setup instructions
• Editing .fish scripts? fish-lsp adds editor features for the Fish language. It is a separate TypeScript language server, not the Rust rewrite of the shell. Follow its client-specific setup; Fish’s interactive completions are a different feature.
• Editing Rust source files? rust-analyzer provides language-server support for Rust code. Choose the server for the language you are editing, not the language your shell was built with.

Choosing the rest of your command-line setup? Compare terminal, shell, history and file-manager roles →

Sources checked October 14, 2026.