feat: add test builtin#179
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Implements POSIX `test` for a useful subset of operators: - File predicates: `-e`, `-f`, `-d`, `-s` - String predicates: `-n`, `-z` - String comparison: `=`, `!=` - Integer comparison: `-eq`, `-ne`, `-lt`, `-le`, `-gt`, `-ge` - Negation: `!` Returns exit code 0 on true, 1 on false, 2 on syntax error. Composition with `-a` / `-o` / parens is intentionally not supported — chain separate invocations with `&&` / `||` instead, which is the bash-recommended idiom anyway. The `[ ... ]` alias is not registered yet: the shell's glob expansion currently treats an unquoted `[` as the start of a character class and errors on invalid patterns. Exposing `[` cleanly requires teaching the glob expander to fall back to literal on pattern compile errors, which is a separate change. Refs #134.
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Implements POSIX
testfor a useful subset of operators:-e,-f,-d,-s-n,-z=,!=-eq,-ne,-lt,-le,-gt,-ge!Returns exit code 0 on true, 1 on false, 2 on syntax error.
Composition with
-a/-o/ parens is intentionally not supported —chain separate invocations with
&&/||instead, which is thebash-recommended idiom anyway and composes with the shell's existing
boolean list support.
The
[ ... ]alias is not registered yet. The shell's glob expansioncurrently treats an unquoted
[as the start of a character class anderrors when the pattern doesn't compile, which makes
[ 1 -eq 1 ]unusable without quoting. Exposing
[cleanly requires teaching theglob expander to fall back to literal on pattern compile errors (what
bash does when
failglobis off). That's a separate change worth doingon its own.
Refs #134.