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Home > Forums > Programmers > Languages > C++: UNIX Forum

Re-Direct cerr...

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mbaranski (Programmer)

2 Mar 01 16:31

I've got a program that does some stuff, and has logging information being printed to one file, other stuff going to cout, and errors going to cerr. I want to re-direct cerr to a log file, without messing up anything else. Basically, if there is an option specified in the config file, write cerr to ./error.log, otherwise, write it to /dev/null or whatever. How do I do this? Can I just open a fstream object and assing cerr to it? I'd appreciate an example (simple, of course)

Thanks
Mike B.

Disclaimer:
Beware: Studies have shown that research causes cancer in lab rats.

Masi (Programmer)

4 Mar 01 12:22

You could do it at the prompt in this way:
program_name 2> error.log

Is it enough?

mbaranski (Programmer)

5 Mar 01 14:48

No, that redirects standard out, which I'm using for mysql output. I'm calling the program like:

./import | mysql -f

Which imports a database by connectiing over a network and pushing the data out to standard out in the mysql file format. I am printing logging and error messages via cerr, instead of cout, which is currently pointed at the terminial screren, even when piping or re-directing. I need to open an ostream or something and tell cout to use it to write to a file.

Thanks anyway.

Disclaimer:
Beware: Studies have shown that research causes cancer in lab rats.

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