pipe

来源： https://stackoverflow.com/questions/55381321/could-not-find-function-with-dplyr-loaded

来源： https://stackoverflow.com/questions/44671307/how-to-use-stdin-twice-from-pipe

问题 I have a producer Thread as well as consumer thread where producer runs faster than consumer i need to transfer data from producer and process it on consumer, producer will give an array of 1000 elements every second and consumer should wait till it has 10 sets of arrays and will process it (consumer runs every 10 seconds) i could see that we can modify POSIX message queue to input an array of 1000 elements double array which is a better method to transfer real data, POXIS message queue or

问题 I have a producer Thread as well as consumer thread where producer runs faster than consumer i need to transfer data from producer and process it on consumer, producer will give an array of 1000 elements every second and consumer should wait till it has 10 sets of arrays and will process it (consumer runs every 10 seconds) i could see that we can modify POSIX message queue to input an array of 1000 elements double array which is a better method to transfer real data, POXIS message queue or

问题 I have a producer Thread as well as consumer thread where producer runs faster than consumer i need to transfer data from producer and process it on consumer, producer will give an array of 1000 elements every second and consumer should wait till it has 10 sets of arrays and will process it (consumer runs every 10 seconds) i could see that we can modify POSIX message queue to input an array of 1000 elements double array which is a better method to transfer real data, POXIS message queue or

问题 I have a bash script that produces some text from a pipe of commands. Based on a command line option I want to do some validation on the output. For a contrived example... CHECK_OUTPUT=$1 ... check_output() { if [[ "$CHECK_OUTPUT" != "--check" ]]; then # Don't check the output. Passthrough and return. cat return 0 fi # Check each line exists in the fs root while read line; do if [[ ! -e "/$line" ]]; then echo "Error: /$line does not exist" return 1 fi echo "$line" done return 0 } ls /usr |

问题 I have a pipesModule in Angular library project when I import the module to another project, I got an error tip: Unable to resolve signature for pipe invocation in vs code, it still works, build without errors, but I have no idea how to fix it, I got so many red lines... Now, the error tip changed after an upgrade, like this: Unable to resolve signature for call of pipeName , but I think that means the same thing Every pipe can get this error, I can't bear the red line..., but it can be

问题 I'd like to pipe ffmpeg segments to s3 without writing them to disk. ffmpeg -i t2.mp4 -map 0 -c copy -f segment -segment_time 20 output_%04d.mkv Is it possible to modify this command so that ffmpeg writes segments to an s3 bucket? Something like this perhaps? ffmpeg -i t2.mp4 -map 0 -c copy -f segment -segment_time 20 pipe:1 \ | aws s3 cp - s3://bucket/output_%04d.mkv When I run the command above I receive this error Could not write header for output file #0 (incorrect codec parameters ?):

问题 I have a simple C++ application which is supposed to read lines from a POSIX named pipe: #include<iostream> #include<string> #include<fstream> int main() { std::ifstream pipe; pipe.open("in"); std::string line; while (true) { std::getline(pipe, line); if (pipe.eof()) { break; } std::cout << line << std::endl; } } Steps: I create a named pipe: mkfifo in . I compile & run the C++ code using g++ -std=c++11 test.cpp && ./a.out . I feed data to the in pipe: sleep infinity > in & # keep pipe open,

问题 I would like to store the executable name of the current inferior in a variable. I way to obtain the executable name in the gdb CLI is the following: pipe info inferiors | awk '{ if ($1 == "*") { print $4} }' But I am unable to store the output of this expression in a variable. The expression uses single and double quotes, which makes gdb complain if it is combined with set and eval . (gdb) set $exec="pipe info inferiors | awk '{ if ($1 == "*") { print $4} }'" Argument to arithmetic operation