# Shell Failing on #GP4 due to #OO8 'Expected prompt ("$ ") but received ""' **URL:** \ **Category:** Challenges\ **Tags:** challenge:shell\ **Created:** [June 21, 2025, 2:18pm UTC](https://forum.codecrafters.io/t/shell-failing-on-gp4-due-to-oo8-expected-prompt-but-received/12444 "2025-06-21T14:18:19Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![LyndonFan](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/lyndonfan/32/13302_2.png) [@LyndonFan](https://forum.codecrafters.io/u/LyndonFan)\ **Post date:** [June 21, 2025, 2:18pm UTC](https://forum.codecrafters.io/t/shell-failing-on-gp4-due-to-oo8-expected-prompt-but-received/12444/1 "2025-06-21T14:18:19Z")
I’m stuck on Stage #GP4. All the tests are passing until first stage #OO8, where the tester seems to not receive the "$ " input before the test fails. When I ran the shell locally it does show "$ " on start up. It used to work before but is somehow failing now. I’ve tried - refactoring how the program finds executables. From loading all programs on start up, to asynchronously (`go func() { ...}()`) to not at all (the current version). But none of them worked. - refactoring how early it prints the "$ " line, e.g. - looking for similar errors, where I found reports on [May 19](https://forum.codecrafters.io/t/shell-failing-oo8-to-gp4-due-to-expected-prompt-but-received-issue/10769/3) and [Jun 14](https://forum.codecrafters.io/t/stage-oo8-failing-at-stage-gp4-with-expected-prompt-but-received-issue/12144). - manually changing the language pack from 1.22 to 1.24 in codecrafters.yml but it told me to create a new repo instead. It suggests this isn’t an uncommon issue. Is there some way for us to upgrade the language pack ourselves? Here are my logs: ```auto [compile] Compilation successful. [tester::#IP1] Running tests for Stage #IP1 (Run a program) [tester::#IP1] [setup] export PATH=/tmp/quz:$PATH [tester::#IP1] [setup] Available executables: [tester::#IP1] [setup] - custom_exe_1900 [tester::#IP1] [setup] - custom_exe_4685 [tester::#IP1] Running ./your_shell.sh [your-program] $ custom_exe_1900 Alice Alice [your-program] Program was passed 3 args (including program name). [your-program] Arg #0 (program name): custom_exe_1900 [your-program] Arg #1: Alice [your-program] Arg #2: Alice [your-program] Program Signature: 1031512840 [tester::#IP1] ✓ Received expected response [your-program] $ custom_exe_4685 Alice David David [your-program] Program was passed 4 args (including program name). [your-program] Arg #0 (program name): custom_exe_4685 [your-program] Arg #1: Alice [your-program] Arg #2: David [your-program] Arg #3: David [your-program] Program Signature: 6637881288 [tester::#IP1] ✓ Received expected response [your-program] $ [tester::#IP1] Test passed. [tester::#MG5] Running tests for Stage #MG5 (The type builtin: executable files) [tester::#MG5] [setup] export PATH=/tmp/qux:$PATH [tester::#MG5] [setup] export PATH=/tmp/foo:$PATH [tester::#MG5] [setup] PATH is now: /tmp/foo:/tmp/qux:/go/bin:... [tester::#MG5] [setup] Available executables: [tester::#MG5] [setup] - my_exe [tester::#MG5] Running ./your_shell.sh [your-program] $ type cat [your-program] cat is /bin/cat [tester::#MG5] ✓ Received expected response [your-program] $ type cp [your-program] cp is /bin/cp [tester::#MG5] ✓ Received expected response [your-program] $ type mkdir [your-program] mkdir is /bin/mkdir [tester::#MG5] ✓ Received expected response [your-program] $ type my_exe [your-program] my_exe is /tmp/foo/my_exe [tester::#MG5] ✓ Received expected response [your-program] $ type invalid_blueberry_command [your-program] invalid_blueberry_command not found [tester::#MG5] ✓ Received expected response [your-program] $ type invalid_banana_command [your-program] invalid_banana_command not found [tester::#MG5] ✓ Received expected response [your-program] $ [tester::#MG5] Test passed. [tester::#EZ5] Running tests for Stage #EZ5 (The type builtin: builtins) [tester::#EZ5] Running ./your_shell.sh [your-program] $ type echo [your-program] echo is a shell builtin [tester::#EZ5] ✓ Received expected response [your-program] $ type exit [your-program] exit is a shell builtin [tester::#EZ5] ✓ Received expected response [your-program] $ type type [your-program] type is a shell builtin [tester::#EZ5] ✓ Received expected response [your-program] $ type invalid_apple_command [your-program] invalid_apple_command not found [tester::#EZ5] ✓ Received expected response [your-program] $ type invalid_pear_command [your-program] invalid_pear_command not found [tester::#EZ5] ✓ Received expected response [your-program] $ [tester::#EZ5] Test passed. [tester::#IZ3] Running tests for Stage #IZ3 (The echo builtin) [tester::#IZ3] Running ./your_shell.sh [your-program] $ echo blueberry grape mango [your-program] blueberry grape mango [tester::#IZ3] ✓ Received expected response [your-program] $ echo pear mango [your-program] pear mango [tester::#IZ3] ✓ Received expected response [your-program] $ [tester::#IZ3] Test passed. [tester::#PN5] Running tests for Stage #PN5 (The exit builtin) [tester::#PN5] Running ./your_shell.sh [your-program] $ invalid_blueberry_command [your-program] invalid_blueberry_command: command not found [tester::#PN5] ✓ Received command not found message [your-program] $ exit 0 [tester::#PN5] ✓ Program exited successfully [tester::#PN5] ✓ No output after exit command [tester::#PN5] Test passed. [tester::#FF0] Running tests for Stage #FF0 (REPL) [tester::#FF0] Running ./your_shell.sh [your-program] $ invalid_command_1 [your-program] invalid_command_1: command not found [tester::#FF0] ✓ Received command not found message [your-program] $ invalid_command_2 [your-program] invalid_command_2: command not found [tester::#FF0] ✓ Received command not found message [your-program] $ invalid_command_3 [your-program] invalid_command_3: command not found [tester::#FF0] ✓ Received command not found message [your-program] $ invalid_command_4 [your-program] invalid_command_4: command not found [tester::#FF0] ✓ Received command not found message [your-program] $ invalid_command_5 [your-program] invalid_command_5: command not found [tester::#FF0] ✓ Received command not found message [your-program] $ [tester::#FF0] Test passed. [tester::#CZ2] Running tests for Stage #CZ2 (Handle invalid commands) [tester::#CZ2] Running ./your_shell.sh [your-program] $ invalid_pineapple_command [your-program] invalid_pineapple_command: command not found [tester::#CZ2] ✓ Received command not found message [tester::#CZ2] Test passed. [tester::#OO8] Running tests for Stage #OO8 (Print a prompt) [tester::#OO8] Running ./your_shell.sh [tester::#OO8] Expected prompt ("$ ") but received "" [tester::#OO8] Assertion failed. [tester::#OO8] Test failed (try setting 'debug: true' in your codecrafters.yml to see more details) ``` And here’s a snippet of my code: ```go func main() { reader := bufio.NewReader(os.Stdin) for { fmt.Print("$ ") input, err := reader.ReadString('\n') if err != nil { fmt.Println("got error reading input:", err.Error()) continue } err = runInput(input) if err != nil { fmt.Println(err.Error()) } } } ``` ---
**Author:** ![LyndonFan](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/lyndonfan/32/13302_2.png) [@LyndonFan](https://forum.codecrafters.io/u/LyndonFan)\ **Post date:** [June 21, 2025, 2:18pm UTC](https://forum.codecrafters.io/t/shell-failing-on-gp4-due-to-oo8-expected-prompt-but-received/12444/3 "2025-06-21T14:18:50Z")
My current progress on github: [https://github.com/LyndonFan/codecrafters-shell-go](https://github.com/LyndonFan/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 22, 2025, 5:16am UTC](https://forum.codecrafters.io/t/shell-failing-on-gp4-due-to-oo8-expected-prompt-but-received/12444/5 "2025-06-22T05:16:18Z")
Hey @LyndonFan, I’ve upgraded the buildpack for your repo to v1.24 and pushed a new commit to it. You can run `git pull` to sync the changes. > Is there some way for us to upgrade the language pack ourselves? The easiest way is to start a new repo. For existing repos, upgrades currently need to be done manually by our team. ---
**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:** [June 27, 2025, 5:16am UTC](https://forum.codecrafters.io/t/shell-failing-on-gp4-due-to-oo8-expected-prompt-but-received/12444/7 "2025-06-27T05:16:30Z")
This topic was automatically closed 5 days after the last reply. New replies are no longer allowed.