CODEWITHSUNDEEP
cstdoutstderr
Dago
Dago

Reputation: 808

C stderr to a file

Hello I am writing a program in C. I start it like that after compilation.

/a.out <source.txt >output

I want all messages to be printed to the output.txt. However I would like to send errors to the console, not to the file. The problem is when i use this statement in my code:

freopen( "errors.txt", "w", stderr );
fprintf (stderr, "%s\n", s);

All Erros are also printed to the output.txt file not to errors.txt I would be grateful for any help.

Upvotes: 2

Views: 5547

Answers (1)

dmi
dmi

Reputation: 1479

By default the stdout and stderr are together routed to your console. However you can redirect the error stream to a file with the help of the following form of your command line: ./a.out 2>logfile.log. In that case the stdout will still come to the console, but stderr will go to the file.

Upvotes: 1

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