1 files changed, 42 insertions, 2 deletions

diff --git a/modules/ext/shell.js b/modules/ext/shell.js
index cb26484..ff07d92 100644
--- a/modules/ext/shell.js
+++ b/modules/ext/shell.js
@@ -34,6 +34,46 @@ class ShellModule {
         this.commands['script'] = (args) => this._cmdScript(args);
         this.commands['sh'] = (args) => this._cmdScript(args);
         this.commands['set'] = () => this._cmdSet();
+        // v4.6.133: `test` / `[` were not registered, so `[ -f /x ] && echo yes` fell through to the
+        // AI fallback and asked a model whether a file exists. _evalTest() already implemented the
+        // operators (-f -d -e -z -n ! = !=) for the if/while parser; the command was simply missing.
+        // `test` already means "run the regression suite" in the on-demand test-suite module, so a
+        // non-expression argument list is delegated to whatever handler was registered before us.
+        const prevTest = this.commands['test'];
+        this.commands['test'] = (args) => this._cmdTest(args, 'test', prevTest);
+        this.commands['['] = (args) => this._cmdTest(args, '[');
+    }
+
+    /** True when the argv looks like a POSIX test expression rather than a suite-runner subcommand. */
+    _looksLikeTest(expr) {
+        if (!expr) return false;
+        if (/^(?:!(?:\s|$)|-[fderwxszn]\b)/.test(expr)) return true;      // `-f x`, `! -d y`
+        if (/\s(?:=|==|!=)\s/.test(expr)) return true;                    // `a = b`
+        return false;
+    }
+
+    /** POSIX-ish `test`/`[`: silent on success, throws a silent error on false so `&&`/`||` skip. */
+    _cmdTest(args, name, fallback) {
+        let expr = (args || []).join(' ').trim();
+        if (name === 'test' && !this._looksLikeTest(expr) && typeof fallback === 'function') {
+            return fallback(args);          // `test`, `test auto`, `test list` -> the suite runner
+        }
+        if (name === '[') {
+            if (!expr.endsWith(']')) throw new Error("[ : missing ']'");
+            expr = expr.slice(0, -1).trim();
+        }
+        if (!expr) {                       // `test` with no expression: false, and no output
+            const e = new Error(''); e.silent = true; throw e;
+        }
+        if (!this._evalTest(expr)) {
+            const e = new Error(''); e.silent = true; throw e;   // POSIX: exit 1 prints nothing
+        }
+    }
+
+    /** Error printer shared by the shell paths: `silent` errors are control flow (a false test), not failures. */
+    _printErr(term, e) {
+        if (!e || e.silent) return;
+        (term || this.terminal).print('Error: ' + (e.message || e), 'error');
     }
 
     // ── Hook into terminal.executeCommand ──
@@ -123,7 +163,7 @@ class ShellModule {
                                     await self.commands[cmd](args);
                                     lastOk = true;
                                 } catch(e) {
-                                    this.print('Error: ' + e.message, 'error');
+                                    self._printErr(this, e);
                                     lastOk = false;
                                 }
                             } else {
@@ -131,7 +171,7 @@ class ShellModule {
                                     await this.security.checkAndRun(expandedCmd);
                                     lastOk = true;
                                 } catch(e) {
-                                    this.print('Error: ' + e.message, 'error');
+                                    self._printErr(this, e);
                                     lastOk = false;
                                 }
                             }