The standard output stream (stdout) is the stream where a program writes its output data.
Questions tagged [stdout]
4740 questions
29
votes
1 answer
How to configure logs/catalina.out of tomcat 6 for per-app. (Configure web-app specific log file for sys.out, sys.err)
Requirement is this ...
We have our 3 web-applications deployed in RHEL-5 server, we deployed apps with tomcat 6.0.16.
We want to configure stdout, stderr, which are coming in tomcat/logs/catalina.out in app specific log file like,…
Garudadwajan
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29
votes
3 answers
C restore stdout to terminal
I am working with a multi-thread program.
First I redirect my stdout to a certain file. No problem there (I used dup2(fd, 1) where fd is the file descriptor for the file).
Afterwards, I need to redirect my stdout to the terminal again.
My first…
Alessandroempire
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28
votes
2 answers
How to get STDOUT from a QProcess?
I thought I was going to get the output from a QProcess using the following code:
// Start the process
process.start(tr("php-cgi www/test.php"),QIODevice::ReadWrite);
// Wait for it to start
if(!process.waitForStarted())
return 0;
// Continue…
Nathan Osman
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28
votes
1 answer
Using tee to get realtime print statements from python
I have a python script that looks something like this:
for item in collection:
print "what up"
#do complicated stuff that takes a long time.
In bash, I run this script by doing the following:
$ python my.py | tee my_file.txt
However, all I…
robert
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27
votes
2 answers
Why does 'java -version' go to stderr?
Is there any special reason for the results of java -version going to stderr?
For example, this command executed from Windows' prompt line:
java -version > java_version.txt
leaves the file java_version.txt empty.
EDIT: The same happens with the…
Jagger
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26
votes
1 answer
Is stdout line buffered, unbuffered or indeterminate by default?
Section 7.19.3/7 of c99 states that:
At program start-up, three text streams are predefined and need not be opened explicitly - standard input (for reading conventional input), standard output (for writing conventional output), and standard error…
paxdiablo
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26
votes
2 answers
Notice: Use of undefined constant STDOUT - assumed 'STDOUT'
I am trying to set up Amazon Aws Php SDK in Xampp.
After installing the SDK, I am trying to download a bucket from Amazon S3, using the following code.
SatheeshJM
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26
votes
4 answers
How to read QProcess output to QString?
I have a code that uses QProcess like this :
int main(int argc, char *argv[])
{
int status=0;
QProcess pingProcess;
QString ba;
QString exec = "snmpget";
QStringList params;
params << "-v"
<< "2c"
<<…
sersem1
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26
votes
2 answers
Capturing SSH output as variable in bash script
I've been struggling with this problem when writing a bash script.
Basically, I want to measure the time of a program on a remote server, so I use the command:
/usr/bin/time -f %e sh -c "my command > /dev/null 2>&1" to execute the program.
However,…
Andy Dang
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25
votes
5 answers
Writing to stdin and reading from stdout (UNIX/LINUX/C Programming)
I was working on an assignment where a program took a file descriptor as an argument (generally from the parent in an exec call) and read from a file and wrote to a file descriptor, and in my testing, I realized that the program would work from the…
Tim
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25
votes
7 answers
stdout and need to flush it C++
I have some C++ code that uses cout statements for debug purposes and for some reason I can't get all the data to print unless I do a std::cout.flush(); at the end.
I don't quite understand why this flush operation is needed.
Anyone have any…
Dixon Steel
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25
votes
2 answers
Intercepting stdout of a subprocess while it is running
If this is my subprocess:
import time, sys
for i in range(200):
sys.stdout.write( 'reading %i\n'%i )
time.sleep(.02)
And this is the script controlling and modifying the output of the subprocess:
import subprocess, time, sys
print…
Paul
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25
votes
5 answers
How do you tell Spring Boot to send the embedded Tomcat's access logs to stdout?
In a standalone Spring Boot web application (executable jar), how do you tell Spring Boot that we want the embedded Tomcat instance's HTTP access logs to be sent to stdout?
Les Hazlewood
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25
votes
4 answers
Why does printf() not print anything before sleep()?
I'm just learning C with Kernighan and Ritchie's book; I'm in the basics of the fourth chapter ("Functions and Program Structure"). The other day I became curious about the sleep() function, so tried to use it like this:
#include
#include…
John Woods
25
votes
2 answers
How to test print statements?
You want to write unittest-cases for a function like that:
def test_me(a):
for b in c:
print do_something(a,b)
At first I thought about just collecting the outputs of do_something in a string and then returning it, to print and test the…
erikbstack
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