# \#QP2 submission failing because of a #UN3 failure **URL:** \ **Category:** Challenges\ **Tags:** challenge:shell\ **Created:** [June 28, 2026, 9:51am UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186 "2026-06-28T09:51:47Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![aniketpt](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/aniketpt/32/27033_2.png) [@aniketpt](https://forum.codecrafters.io/u/aniketpt)\ **Post date:** [June 28, 2026, 9:51am UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/1 "2026-06-28T09:51:47Z")
When I submitted my solution for stage #QP2, it passed the tests for the target stage, but failed for stage #UN3 (a stage from previous section). My code already passed that stage, so I am trying to understand why its failing the test now. ```auto [tester::#QP2] Running tests for Stage #QP2 (Command Completion - Builtin completion) [tester::#QP2] Running ./your_program.sh [tester::#QP2] ✓ Received prompt ($ ) [tester::#QP2] Typed "ech" [tester::#QP2] ✓ Prompt line matches "$ ech" [tester::#QP2] Pressed "" (expecting autocomplete to "echo" followed by a space) [tester::#QP2] ✓ Prompt line matches "echo " [your-program] $ echo [tester::#QP2] Tearing down shell [tester::#QP2] Running ./your_program.sh [tester::#QP2] ✓ Received prompt ($ ) [tester::#QP2] Typed "exi" [tester::#QP2] ✓ Prompt line matches "$ exi" [tester::#QP2] Pressed "" (expecting autocomplete to "exit" followed by a space) [tester::#QP2] ✓ Prompt line matches "exit " [your-program] $ exit [tester::#QP2] Tearing down shell [tester::#QP2] Test passed. [tester::#UN3] Running tests for Stage #UN3 (Redirection - Append stderr) [tester::#UN3] [setup] export PATH=/tmp/strawberry/strawberry/banana:$PATH [tester::#UN3] Running ./your_program.sh [your-program] $ ls -1 nonexistent >> /tmp/pig/bee.md [tester::#UN3] Didn't find expected line. [tester::#UN3] Expected: "ls: nonexistent: No such file or directory" [tester::#UN3] Received: "" (no line received) [tester::#UN3] Test failed ``` The test is using `>>`, but I think it should have used `2>>` instead. Please let me know in case I am wrong here. ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [June 28, 2026, 4:13pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/3 "2026-06-28T16:13:02Z")
Hey @aniketpt, could you [upload your code to GitHub](https://docs.codecrafters.io/features/publish-to-github) and share the link? It will be much easier to debug if I can run it directly. ---
**Author:** ![aniketpt](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/aniketpt/32/27033_2.png) [@aniketpt](https://forum.codecrafters.io/u/aniketpt)\ **Post date:** [June 28, 2026, 4:43pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/4 "2026-06-28T16:43:51Z")
Sure, please check here - [GitHub - aniketpt/codecrafters-shell-go · GitHub](https://github.com/aniketpt/codecrafters-shell-go) ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [June 28, 2026, 4:47pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/5 "2026-06-28T16:47:45Z")
@aniketpt Looks like your code is no longer passing the second stage **#CZ2 (Handle invalid commands)**. ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/f/5/f56b87199096ebf86187cf17f70900d9113dd64a.png) **Suggestions** : 1. Use [our CLI](https://docs.codecrafters.io/cli/installation) to test against previous stages by running: ```auto codecrafters test --previous ``` 1. Focus on fixing the early stages first, as later stages depend on them. ---
**Author:** ![aniketpt](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/aniketpt/32/27033_2.png) [@aniketpt](https://forum.codecrafters.io/u/aniketpt)\ **Post date:** [June 28, 2026, 5:34pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/6 "2026-06-28T17:34:14Z")
I see, thank you for pointing me in the right direction. My changes in i/o layer must have broken older functionalities (at least for the online judge). ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [June 28, 2026, 5:42pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/7 "2026-06-28T17:42:29Z")
Could you give this a try and see if it resolves the error? ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/a/e/ae8f39e852bace4606219988177c9872aff5f8a4.png) ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/7/0/700657133935c15703e22c7c8870394f6e6dc27d.svg) [@system](https://forum.codecrafters.io/u/system)\ **Post date:** [July 3, 2026, 5:43pm UTC](https://forum.codecrafters.io/t/qp2-submission-failing-because-of-a-un3-failure/16186/8 "2026-07-03T17:43:25Z")
Closed on July 3, 2026, 5:43pm UTC This topic was automatically closed 5 days after the last reply. New replies are no longer allowed.