shfmt

shfmt is a shell formatter for normalizing script layout across repos, CI, and editor workflows. It also walks directories, detects shell files by extension or shebang, and can parse scripts into a typed shell AST.

• Reformat shell scripts consistently across a repo, write fixes in place, or show diffs and changed-file lists for CI and pre-commit checks.
• Find shell scripts recursively and validate syntax across Bash, POSIX sh, mksh, bats, and zsh without depending on a particular runtime shell.
• Convert shell source to a typed JSON syntax tree, transform or inspect it, and print it back to shell code with --from-json.

• The core commands are non-interactive, deterministic, and easy to compose in edit-then-verify loops for shell code changes.
• Repo-wide runs, stdin support, explicit exit failures on diffs or parse errors, and EditorConfig handling make it practical in scripts, CI, and automated refactors.
• Structured output exists, but mainly as an AST via --to-json; normal formatting and directory-walk flows still return plain text paths, diffs, and errors.

• Formatting is intentionally opinionated, with limited style knobs and no support for disabling formatting on selected line ranges.
• --to-json only works with stdin, so machine-readable output is not the default interface for batch formatting runs.