[DZH166]

Problem

DockerSession.execute() filters command output with:

line.strip() == b"echo $?" or line.strip().isdigit()

The isdigit() branch was meant to drop the single exit-status line printed by echo $?, but it drops every output line that consists only of digits. The exit status is always the last line before the $ prompt, so numeric command output is silently swallowed while the tool reports success:

wc -l data.txt  -> ''            (expected '42')
seq 1 3         -> ''            (expected '1\n2\n3')
echo hi         -> 'a\nb'        (unaffected)

This hits every sandboxed run (config.sandbox.use_sandbox=true -> DockerSandbox.run_command / SandboxFileOperator) whenever a command prints counts, line numbers, hashes-less numeric ids, timestamps or seq output.

Fix

Track the line count and only drop the final status line that precedes the prompt, instead of dropping any numeric line.

Tests

tests/sandbox/test_terminal_output_parsing.py (3 tests):

• wc -l output is preserved;
• seq 1 3 output is preserved;
• ordinary text output is unchanged.

pytest tests/sandbox/test_terminal_output_parsing.py -q    # before: 2 failed, 1 passed   after: 3 passed