stderr

Looking for an options which let me to redirect R diagnostic messages (produces by message() ) to stdout , not stderr as it is by default. message manual states: The default handler sends the message to the stderr() connection. So the question is how can I change this default behavior? still leaving redirection of warning() and stop() intact. Already tried sink type='message' but it redirects all (messages, warnings, errors). If anyone is willing to test, this is sample script exec_test.R : print("using print") cat("using cat\n") message("using message") warning("using warning") stop("using

I have the following request library(RCurl) res=getURL("http://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=RCurl&btnG=Search", .opts=list(verbose = TRUE) ) and would like to capture the verbose output of the call (i.e., what is printed in red in the R console). I thought that the output lines are messages and are therefore printed to stderr() . The following works for messages sink(textConnection("test","w"),type="message") message("test message") sink(stderr(),type="message") test #[1] "test message" but not if I replace message("test message") by the RCurl request res=getURL(.....) as

The shell command $ avrdude -c usbtiny outputs text to stderr. I cannot read it with commmands such as head-less-more cos it is not stdout. I want the text to stdout or to a file. How can I do it in C? I have tried to solve the problem by my last question but still unsolved. I've not tried something like this in OpenBSD, but in at least a few *nix-like systems, you can do this using dup2 . #include <unistd.h> #include <stdio.h> int main(void) { fprintf(stderr, "This goes to stderr\n"); dup2(1, 2); //redirects stderr to stdout below this line. fprintf(stderr, "This goes to stdout\n"); } The

There're lots of print function ( python 2.7 ) in my program. Is there any way I can add a few lines then all the output can be redirected to stderr ? What I want is python codes but not linux pipeline. For example, my program is like: print 'hello world' I would like to add some codes like: redirect_output_to_stderr() print 'hello world' Then all the output can be redirected to stderr . I know print >> sys.stderr, 'hello world' can achieve my goal, but is it any way that can prevent from modifying the existed codes? Do this in your method: import sys sys.stdout = sys.stderr In python 2.7 you

I've got a simple setup to log a message: JDK 8 Update 65 and Eclipse Mars import java.util.logging.Logger; public class Example { private final static Logger LOGGER = Logger.getLogger(Example.class.getName()); public static void main(String[] args) { LOGGER.info("Test"); } } I would expect to get an output on the stdout , just like using System.out.println(); . But instead it gets printed out on the stderr , which results in a red font on the eclipse console: I know that I can change this behavior by writing a custom Handler , but I wish to know why the default output appears on the stderr

I'm writing some R notes with Sweave and would like to show common errors. For example, <<echo=TRUE, eval=TRUE>>= x = 5 #Case matters! x*X @ However when sweaving, the document won't compile due to the R error. Is there any way to make sweave compile and show the (nicely formated) error? As Shane suggests, use <<echo=TRUE,eval=FALSE>> for the code that will error, but you want to display, and then again with <<echo=FALSE,eval=TRUE,results=verbatim>> but with the same code wrapped in a try. There's an example here: http://tolstoy.newcastle.edu.au/R/help/05/09/11690.html This is a non-issue with

I need to start a process, lets say foo . I would like to see the stdout/stderr as normal, but grep the stderr for string bar . Once bar is found in the stderr foo should be killed. Is this possible? I initially wrote a way to do this that involved stream swizzling, but it wasn't very good. Some of the comments relate to that version. Check the history if you're curious. Here's a way to do this: (PIDFILE=$(mktemp /tmp/foo.XXXXXX) && trap "rm $PIDFILE" 0 \ && { foo \ 2> >(tee >(grep -q bar && kill $(cat $PIDFILE)) >&2) \ & PID=$! && echo $PID >$PIDFILE ; wait $PID || true; }) Good old-fashioned