Stderr redirection

[superxcgm]

Epic

Process

Description

Shell should able to redirect stderr to other file or same as stdout.

AC

1. Redirect stderr to other file (override) Given: User type some-command 2> a.out (For example: echo '1 / 0' | bc 2> a.out) When: User hit <Enter> Then: shell should clear content of file a.out redirect stderr to a.out

2. Redirect stderr to other file (append) Given: User type some-command 2>> a.out (For example: echo '1 / 0' | bc 2>> a.out) When: User hit <Enter> Then: shell should not clear content of file a.out, redirect stderr to end of a.out

3. Redirect stderr to same as stdout (override) Given: User type some-command > a.out 2>&1 (For example: echo '1 / 0' | bc > a.out 2>&1) When: User hit <Enter> Then: shell should clear content of file a.out, redirect stderr and stdout to a.out

4. Redirect stderr to same as stdout (append) Given: User type some-command >> a.out 2>&1 (For example: echo '1 / 0' | bc >> a.out 2>&1) When: User hit <Enter> Then: shell should not clear content of file a.out, redirect stderr and stdout to end of a.out

5. Redirect stderr to different file as stdout Given: User type some-command > a.out 2> b.out When: User hit <Enter> Then: shell should clear content of file a.out redirect stdout to a.out, and clear content of file b.out redirect stderr to b.out.

Demo test c code for case 5.

#include <stdio.h>

int main() {
    printf("hello world\n");
    fprintf(stderr, "fuck the world\n");
    return 0;
}

[lq1149622825]

tasking：

• Identify whether the redirected output needs to be redirected to the file by mistake
• Error redirect

[superxcgm]

QA

1. Redirect stderr to other file (override) Given: User type some-command 2> a.out (For example: echo '1 / 0' | bc 2> a.out) When: User hit <Enter> Then: ✅ shell should clear content of file a.out redirect stderr to a.out

2. Redirect stderr to other file (append) Given: User type some-command 2>> a.out (For example: echo '1 / 0' | bc 2>> a.out) When: User hit <Enter> Then: ✅ shell should not clear content of file a.out, redirect stderr to end of a.out

3. Redirect stderr to same as stdout (override) Given: User type some-command > a.out 2>&1 (For example: echo '1 / 0' | bc > a.out 2>&1) When: User hit <Enter> Then: ✅ shell should clear content of file a.out, redirect stderr and stdout to a.out

4. Redirect stderr to same as stdout (append) Given: User type some-command >> a.out 2>&1 (For example: echo '1 / 0' | bc >> a.out 2>&1) When: User hit <Enter> Then: ✅ shell should not clear content of file a.out, redirect stderr and stdout to end of a.out

5. Redirect stderr to different file as stdout Given: User type some-command > a.out 2> b.out When: User hit <Enter> Then: ✅shell should clear content of file a.out redirect stdout to a.out, and clear content of file b.out redirect stderr to b.out.

Test case already add to functional test.