stderr

I'm following the suggestion in the answer here for redirecting NSLog output on an iOS device to a file, which works great. The problem is that it no longer shows up in the console on the device. What I'd really like is a way to tee the stderr stream to both the console and the file. Does anyone have an idea how to do that? David Potter I found an acceptable answer on another thread ( NSLog() to both console and file ). The solution provided there is to only redirect to a file if a debugger is not detected, like this: if (!isatty(STDERR_FILENO)) { // Redirection code } Thanks to Sailesh for

I am using Windows 2008 R2 and Apache Tomcat 5.5, for your information. STDOUT and STDERR can be automatically logged through Apache Tomcat properties, via Logging tab -> Redirect Stdout and Redirect Stderror textboxes. But I want to control this through log4j. I'm trying to leverage ConsoleAppender and the TimeAndSizeRollingAppender class to rollover what would normally be controlled by Apache Tomcat's innate logging. Basically, however Tomcat redirects stdout and stderr to a file, I want to do the same thing using log4j and the log4j.properties file. I did some digging on this site and

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 happen from the ant script itself. Is this possible, and if so, how to do it? Many thanks! ChssPly76 The recorder task may be able to do what you want: <record name="log.txt" action="start"/> ... <record name="log.txt" action="stop"/> Beyond that, certain tasks

After 30mins of futile attempt to capture the output of wget , I figured out that the program writes to stderr rather than the stdout . Searching in web and stack-overflow reveals this to be a well-known fact. Any idea why is this so? It's well known, because it's in the manual . Reporting messages on stderr is common, because messages are separated from regular output on stdout . This is useful when you combine several tools with a pipe. In this case it would be bad, when regular output and diagnostic messages were mixed up. 来源： https://stackoverflow.com/questions/13066518/why-does-wget

I'm writing a small script, that gathers some information using scapy and then returns some xml code, that I'll pass on to the xmlrpc interface of metasploit. I'd like it that my script only returns xml, and no additional warnings etc. I can suppress most scapy output, with adding the option verbose=0 to my sr1 command. What I still get before every output, and I assume it returns this warning when I'm loading the module, is: WARNING: No route found for IPv6 destination :: (no default route?) I can easily redirect that output, by calling my script like this: ./myscript 2> /dev/null but I'd

I'm using Ghostscript to rasterize the first page of a PDF file to JPEG. To avoid creating tempfiles, the PDF data is piped into Ghoscripts's stdin and the JPEG is "drained" on stdout. This pipeline works like a charm until GS receives invalid PDF data: Instead of reporting all error messages on stderr as I would have expected, it still writes some of the messages to stdout instead. To reproduce: $ echo "Not a PDF" >test.txt $ /usr/bin/gs -q -sDEVICE=jpeg -dBATCH -dNOPAUSE -dFirstPage=1 -dLastPage=1 \ -r300 -sOutputFile=- - < test.txt 2>/dev/null Error: /undefined in Not Operand stack:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: How do I use subprocess.Popen to connect multiple processes by pipes? 7 answers I'd like to use subprocess on the following line: convert ../loxie-orig.png bmp:- | mkbitmap -f 2 -s 2 -t 0.48 | potrace -t 5 --progress -s -o ../DSC00232.svg I found thank to other posts the subprocess documentation but in the example we use only twice pipe. So, I try for two of the three commands and it works p1 = subprocess.Popen(['convert', fileIn, 'bmp:-'], stdout=subprocess.PIPE) # p2 = subprocess.Popen(['mkbitmap',

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm defining a class like this: class StaticRuntimeContext { public: enum Verbosity { kHIGH, kMEDIUM, kLOW, kSILENT }; static void Construct(); static std::ostream& stdout1() {return stdout1_;} static std::ostream& stdout2() {return stdout2_;} static std::ostream& stdout3() {return stdout3_;} static std::ostream& stderr() {return stderr_;} protected: private: static std::ostream& stdout1_; static std::ostream& stdout2_; static std::ostream& stdout3_; static std::ostream& stderr_; }; I'm defining the construct function as: void

I want to redirect STDERR and STDOUT to a variable. I did this. close(STDOUT); close(STDERR); my $out; open(STDOUT, ">>", \$out); open(STDERR, ">>", \$out); for(1..10) { print "print\n"; # this is ok. warn "warn\n"; # same system("make"); # this is lost. neither in screen nor in variable. } The problem with system . I want the output of this call to be captured too. Are you seeking to capture the output in a variable? If so, you have use backticks or qx{} with appropriate redirection. For example, you could use: #/usr/bin/env perl use strict; use warnings; # Ensure we have a way to write