stdout

Does changing Perl 6's $*OUT change standard output for child processes?

由 和自甴很熟 提交于 2019-12-08 15:30:12
问题 I was playing around with shell and how it acts when I change the standard filehandles in the calling program. Proc says: $in, $out and $err are the three standard streams of the to-be-launched program, and default to "-", which means they inherit the stream from the parent process. As far as I can tell, the external program doesn't use the same file handles: #!/Applications/Rakudo/bin/perl6 #`( make an external Perl 6 program the outputs to standard handles ) my $p6-name = 'in-out.p6'.IO;

Getting output from os.system (no subprocess)

由 与世无争的帅哥 提交于 2019-12-08 13:42:07
问题 I am trying to capture and/or remove the output of a command launched by a os.system() call. The script will run under Linux and Windows. I cannot use the subprocess module because the said command is interactive (i.e. : the user can type instructions to trigger various actions). So please do not mention this thread as a duplicate of the common questions asked for instance in : Python: How to get stdout after running os.system? How to store the return value of os.system that it has printed to

When redirecting in bash to stdout or stderr, I actually get redirected to a file

由 廉价感情. 提交于 2019-12-08 12:18:39
问题 I'm saving the output of one command executed on a remote via ssh, but I also execute some echos. In order to see the messages on the screen and not save them to the variable I want to redirect them. I have tried >&1 and >&2 but in each case a file is created with the name either "1" or "2" Is this an issue of expanding quotes or escaping characters? OUTPUT=$(sshpass -p password ssh user@ip 'echo "Message1" >&2 ; su -lc "./rootscript.sh" >&2; echo "$?" ') echo "su output is: $OUTPUT" Output:

How can I output text to another console already open C++

由 半城伤御伤魂 提交于 2019-12-08 11:21:42
问题 Hi this is my first question on stack overflow (Im a junior programmer :P and french too...So apologies in advance for gramatical mistake I make) Im trying to start a elevated process to attach back to the console of the parent to write its output (no crash no error just plain nothingness) Here is my code: int main(int argc, char *argv[]) { HANDLE consoleHandle = GetStdHandle(STD_OUTPUT_HANDLE); if (UAC::IsAppRunningAsAdminMode()) { printf("Process Already elevated\nChecking if self invocated

Stdout redirection not working in iOS without debugger

由 与世无争的帅哥 提交于 2019-12-08 10:14:26
I am trying to redirect output so I can send it over the network. For some reason if you run the code while debugger attached it works perfectly. Once you start the application in normal way the code freezes on the read function and never returns. If someone has any pointers I will highly appreciate it. dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^(void) { static int pipePair[2]; if ( pipe(pipePair) != 0) { return; } dup2(pipePair[1],STDOUT_FILENO); while (true) { char * buffer = calloc(sizeof(char), 1024); ssize_t readCount = read(pipePair[0],buffer,1023); if

Intercepting stdout of a subprocess while it is running

由 不羁的心 提交于 2019-12-08 07:37:42
问题 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 'starting' proc = subprocess.Popen( 'c:/test_apps/testcr.py', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE ) print 'process created' while True: #next_line = proc.communicate()[0] next_line = proc.stdout.readline() if next_line == '' and proc.poll() !=

CMake not redirecting stderr with execute_process

由 荒凉一梦 提交于 2019-12-08 06:41:03
问题 I'm trying to redirect stdout and stderr to the same file using CMake. I'm using the execute_process option in CMake with the ERROR_FILE and OUTPUT_FILE option specified. I'm successfully capturing the output, but the error is not there. What am I doing wrong? File CMakeLists.txt add_test(NAME test${ID} COMMAND ${CMAKE_COMMAND} -DEXE=../examples/test${exampleID} -DID=${ID} -DARGS=${args} -P ${CMAKE_CURRENT_SOURCE_DIR}/Tester.cmake ) File Tester.cmake separate_arguments( ARGS ) # Run the test

Stdout redirection not working in iOS without debugger

由 允我心安 提交于 2019-12-08 06:15:32
问题 I am trying to redirect output so I can send it over the network. For some reason if you run the code while debugger attached it works perfectly. Once you start the application in normal way the code freezes on the read function and never returns. If someone has any pointers I will highly appreciate it. dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^(void) { static int pipePair[2]; if ( pipe(pipePair) != 0) { return; } dup2(pipePair[1],STDOUT_FILENO); while (true)

tcl stop all output going to stdout channel?

由 二次信任 提交于 2019-12-08 06:15:21
问题 I am running a bunch of functions. Each of them outputs a lot of text to stdout which prevents me from quickly checking the results. Is there any easy way to stop output going to the stdout channel? Thanks 回答1: If the functions are just writing to stdout for logging purposes and you want to throw all that stuff away, and they aren't wanting to write to disk or a socket or any other kind of channel, the simplest method is this: rename puts original_puts proc puts args {} ;# A do-nothing

Tracing stdout and stderr in Tcl

由 我们两清 提交于 2019-12-08 05:36:24
问题 I'm not sure if this absurd. Isn't it possible to trace the read and write of stdout and stderr in Tcl? I have tried the below and found no clue. % proc tracer {varname args} { upvar #0 $varname var puts "$varname value : $var" } % trace add variable stdout read tracer % trace add variable stdout write tracer % puts stdout hai hai % puts hai hai % trace add variable stderr write tracer % trace add variable stderr read tracer % puts hai hai % puts stderr hai hai As per the man page of puts ,
订阅 stdout