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Questions tagged [stderr]

The standard error output stream (stderr) is typically used by a program to output error messages or diagnostics.

The standard error stream, stderr, is a stream typically used by a program to output error or diagnostic messages. It is one of the three standard streams used by a UNIX-like program, along with and .

Like , stderr is outputted to the text terminal unless redirected.

The file descriptor for standard output is 2 (two); the POSIX definition is STDERR_FILENO.

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vfprintf crashes in a FreeRTOS based multi-tasked environment running on NXP K64 ARM Cortex-M4

I am having problem in getting "vfprintf" provided by the NewLib library working on a multi-tasked environment based on the FreeRTOS running on a NXP K64 ARM Cortext-M4 processor. The code is compiled using arm gcc compiler. The FreeRTOS is…
Max-Sbz
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Read from stdin, stderr in Python

I have two programs: p1 and p2. I run p1 | p2. I know how to read stdout from p1 in p2 stdin. How can I do the same with stderr. Thanks, Nicolas
dagnic
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How to fix an Empty output for STDERR?

My program is working well and its printing the correct STDOUT but for STDERR I'm getting ''Empty output stream'' can anyone fix my code?, I'm stuck here. Input 285 242 2053 260 310 450 10 682 Output 207229 My code def sum_leaves(K, inputs,…
Joe
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post-commit hook failing with no output

So I'm getting the error post-commit hook failed (exit code 255) with no output. after committing to the repository. The commit goes through fine, but the hook is obviously not working. The hook code…
ashraj98
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Can we use 2>&1 >/dev/null instead of >/dev/null 2>&1

Can we switch order position 2>&1 >/dev/null instead of >/dev/null 2>&1 ? Can we use 1>/dev/null 2>/dev/null instead of >/dev/null 2>&1 ?
Boontawee Home
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Piping input to stdin does not work in c

#include main() { int count; fprintf(stderr, "Starting program.\n"); scanf("%d", &count); fprintf(stderr, "Read: %d\n", count); } I am simply trying to read a number from stdin and repeating it on stderr, when i compile…
user2030160
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How to read the output AND the return value of a external program in shell script?

I'm making a script that reads a tracking code, looks at the results of posting the tracking to a website and prints some messages and has a return value. Here's part of the python code: # update return True if there was a change to the .msg…
user3404142
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How do I re direct STDERR to STDOUT when using system() command in Perl? The 2>&1 solution is not working

I'm calling the system function from a subroutine. the code looks something like this: sub execCmd; my @cmd_line; my $cmd_file_name; #pre-process argv to open a file to read the command. open(F,'<',"$cmd_file_name); my…
Aasritha Pisupati
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I am not understanding several aspects of this c code

void quit() { fprintf(stderr, "memory exhausted\n"); exit(1); } Why do they use fprintf? Also, what is stderr and why is it exit(1) if that part of the program is exiting successfully? Cheers
user3093249
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