stderr

Is there any way to redirect stderr output from a command run with "start" in the Windows command line?

I have a program that I want to automate runs for, since it takes awhile to complete. For some reason it outputs everything to stderr instead of stdout, and I'd like to check on its progress, so I find myself needing to redirect stderr output within a start command. I tried this: start "My_Program" "C:\Users\Me\my_program.exe" --some -...

When debugging on Windows where does stderr go?

When trying to debug a program on Windows I can't seem to find where the output I push to stderr is going. How do I get a hold of my stderr output? Is there a debugger-level setting (MSVC 9) I can change to redirect stderr to some part of the UI? Update: I have not looked into TRACE or OutputDebugString, but the code base is cross-platf...

How can I reinitialize Perl's STDIN/STDOUT/STDERR?

I have a Perl script which forks and daemonizes itself. It's run by cron, so in order to not leave a zombie around, I shut down STDIN,STDOUT, and STDERR: open STDIN, '/dev/null' or die "Can't read /dev/null: $!"; open STDOUT, '>>/dev/null' or die "Can't write to /dev/null: $!"; open STDERR, '>>/dev/null' or die "Can't write to /dev/nu...

suppress/redirect stderr when calling python webrowser

I have a python program that opens several urls in seperate tabs in a new browser window, however when I run the program from the command line and open the browser using webbrowser.open_new(url) The stderr from firefox prints to bash. Looking at the docs I can't seem to find a way to redirect or suppress them I have resorted to usin...

Copy STDOUT to file without stopping it showing onscreen

The program I am making is designed to be run unattended, because of this I have redirected the stdout and stderr streams to a log file. While this works without any problems, while I am still making and debugging the software I would like it to show on the screen as well. Is this possible? To redirect the streams I have used System.se...

Cron send email with STDERR but NOT STDOUT?

I have some python scripts that run on a daily basis in cron. How can I have cron send me an email ONLY WHEN THERE IS STDERR OUTPUT from my script? I want to be able to mail multiple recipients, and set the subject line individually for each cron entry. I tried this: ./prog > /dev/null | mail . . . but it didn't work -- I still rec...

Error when redirecting stdout and stderr of powershell script

The script runs fine when stdout/stderr are not redirected. When I add both stderr and stdout redirection, I getg the following error: How can I avoid it? % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 19.4M 0 0 ...

Should I output warnings to STDERR or STDOUT?

I'm making a script that handles a predefined set of data, outputting to a file. I want to pop up a warning when one datum (which is always "Regular" in every set that I've had access to) is different stating that this value is unhandled (since I don't know how it affects the data). Should I output this warning to stderr or stdout? ...

With bash, how can I pipe standard error into another process?

It's well known how to pipe the standard ouput of a process into another processes standard input: proc1 | proc2 But what if I want to send the standard error of proc1 to proc2 and leave the standard output going to its current location? You would think bash would have a command along the lines of: proc1 2| proc2 But, alas, no. Is ...

Can I send STDOUT and STDERR to a log file and also to the screen in Win32 Perl?

I've searched the Internet and have found some good solutions for teeing STDOUT to 2 different places. Like to a log file and also to the screen at the same time. Here's one example: use IO::Tee; my $log_filename = "log.txt"; my $log_filehandle; open( $log_filehandle, '>>', $log_filename ) or die("Can't open $log_filename for append...

capturing stderr and stdout from an already running process in solaris

I've got a process that is currently running (arserverd) that was started by user "remedy". I am able to log in as this user. I would like to capture stderr and stdout without restarting the process. Is this possible? ...

Can I capture stdout/stderr separately and maintain original order?

I've written a Windows application using the native win32 API. My app will launch other processes and capture the output and highlight stderr output in red. In order to accomplish this I create a separate pipe for stdout and stderr and use them in the STARTUPINFO structure when calling CreateProcess. I then launch a separate thread for ...

Redirect stdout+stderr on c# windows service

I've wrote a windows service in C# using ServiceBase helper. During its execution some procedures on an external native DLL are called. Annoyingly, those procedures write to stdout and/or stderr in a uncontrolled manner as no sources are given for this DLL. Is it possible to redirect those outputs from the C# service to a log file? Reg...

How to redirect stdout stderr in an ant script?

Hi, I am triggering an ant script (via cruise control), and would like to be able to dump the std out and std err for a particular ant target to a plain text file. Yes, I am aware that cruise control already does maintain an XML log file containing this information (among many other things), but for portability reasons, I need this to ...

Redirecting CGI error output from STDERR to a file (python AND perl)

I'm moving a website to Hostmonster and asked where the server log is located so I can automatically scan it for CGI errors. I was told, "We're sorry, but we do not have cgi errors go to any files that you have access to." For organizational reasons I'm stuck with Hostmonster and this awful policy, so as a workaround I thought maybe I'd...

How can I open() and close() STDERR in Perl?

Greetings , I can close the STDERR in perl using; close(STDERR) and after executing some logic , I want to open it back again. How can I do it? I tried open(STDERR,">&STDERR"); and didn't work. Thanks in advance. ...

How to redirect stderr in Python?

I would like to log all the output of a Python script. I tried: import sys log = [] class writer(object): def write(self, data): log.append(data) sys.stdout = writer() sys.stderr = writer() Now, if I "print 'something' " it gets logged. But if I make for instance some syntax error, say "print 'something# ", it wont get ...

Avoid generating empty STDOUT and STDERR files with Sun Grid Engine (SGE) and array jobs

I am running array jobs with Sun Grid Engine (SGE). My carefully scripted array job workers generate no stdout and no stderr when they function properly. Unfortunately, SGE insists on creating an empty stdout and stderr file for each run. Sun's manual states: STDOUT and STDERR of array job tasks will be written into ...

python, and unicode stderr

I used an anonymous pipe to capture all stdout,and stderr then print into a richedit, it's ok when i use wsprintf ,but the python using multibyte char that really annoy me. how can I convert all these output to unicode? UPDATE 2010-01-03: thanx for the reply. but, it seems the str.encode() only worked with print xxx stuff, if there is ...

Where is System.err on Windows?

I have a Java GUI-based application that writes some diagnostic messages to System.out and System.err. Where are these messages output when running on Windows? (For example, on Mac OS X, they're printed to the system console log.) Edit I should add that the Java application is packaged as a .exe, so (right now) I can't launch it using ...