[chaliy]

Requested by Михайло · project thread

What changed

Pattern, case and transform operators now work on array elements, whole arrays and $@/$*: ${a[@]/x/y}, ${a[i]#p}, ${a[@]%s}, ${a[@]^^}, ${m[k],}, ${a[@]@Q}, ${a[0]@U}. Quoted "${a[@]op}" and "${@op}" give one field per element. ${v^^pat}, ${v^pat}, ${v,,pat} and ${v,pat} change only the characters that match pat.

Why

These gaps were found by the pseudo-linus thread's Debian comparison (shell/param-case-modification, shell/param-transform-ops). Common agent idioms such as "${files[@]##*/}" or "${args[@]@Q}" silently produced wrong output.

Before

$ a=(xa ya); echo "${a[@]/a/b}" "${a[@]^^}" "${a[@]@Q}"
xa ya/a/b} xa ya^^} xa ya@Q}
$ v="hello world"; echo "${v^^[lo]}"
HELLO WORLD[lo]}
$ set -- ab 'c d'; printf '<%s>' "${@@Q}"
<'ab c d'>

After

$ a=(xa ya); echo "${a[@]/a/b}" "${a[@]^^}" "${a[@]@Q}"
xb yb XA YA 'xa' 'ya'
$ v="hello world"; echo "${v^^[lo]}"
heLLO wOrLd
$ set -- ab 'c d'; printf '<%s>' "${@@Q}"
<'ab'><'c d'>

All match bash 5.2. The new spec file param-array-ops.test.sh has 8 cases, each checked against real bash.

Risk

Low. The interpreter already applied these operators per element; only the parser was missing the operator after ]. Per-element output keeps the existing 10 MB expansion cap. ${v~}/${v~~} (undocumented case toggles) are still unsupported.

Checklist

• Failing spec written first, verified against bash
• cargo test -p bashkit --lib, --test integration, bash comparison
• cargo clippy -D warnings, cargo fmt
• Docs (compatibility.md) and knowledge/log.md updated

https://claude.ai/code/session_019aFikmptPc91Fj4N2iDXQA

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