Date: Sun, 11 Oct 2009 15:46:16 -0700 From: George Davidovich <freebsd@optimis.net> To: freebsd-questions@freebsd.org Subject: Re: error output redirection Message-ID: <20091011224616.GA75228@marvin.optimis.net> In-Reply-To: <f99a79ec0910111436g62b93acfg873771c04b6b9b1e@mail.gmail.com> References: <f99a79ec0910111436g62b93acfg873771c04b6b9b1e@mail.gmail.com>
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On Sun, Oct 11, 2009 at 11:36:52PM +0200, Stefan Miklosovic wrote: > if error output of some program appear on screen, it is possible to > print it also to some file simultaneously? Depends on the program, but generally, yes. http://en.wikipedia.org/wiki/Standard_streams http://en.wikipedia.org/wiki/Redirection_(computing) > e.g if I "cat" file which do not exist, error is on screen, I want to > add that error to some file (errors.txt) Replacing 'cat file_that_does_not_exist' with 'badcommand' # redirect STDERR to a file badcommand 2> errors.txt # append STDERR to a file badcommand 2>> errors.txt # fun with file descriptors to have it both ways badcommand 3>&1 1>&2 2>&3 | tee errors.txt -- George
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