stdout

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, it appears that I cannot capture the output of my command (SSH) to a variable at all. In fact, the result (time) keeps getting printed out to stdout. The full code is: respond=$(ssh ${fromNode} /usr/bin/time "-f" "%e" "'sh' '-c' 'virsh migrate --live ${VM} qemu+ssh://${toNode}/system --verbose > /dev/null 2>&1'") The value of respond is just empty,

I'm having trouble piping the STDOUT & STDERR to a file when running a program as a systemd service. I've tried adding the following to the .service file: ExecStart=/apppath/appname > /filepath/filename 2>&1 But this doesn't work. The output is ending up in /var/log/messages and is viewable using journalctl but I'd like a separate file. I've also tried setting StdOutput=tty but can't find a way of redirecting this to a file. Any help would be appreciated. systemd.service(5) says: ExecStart= Commands with their arguments that are executed when this service is started. So, systemd runs your

The use case is, in my case, CSS file concatenation, before it gets minimized. To concat two CSS files: cat 1.css 2.css > out.css To add some text at one single position, I can do cat 1.css <<SOMESTUFF 2.css > out.css This will end in the middle. SOMESTUFF To add STDOUT from one other program: sed 's/foo/bar/g' 3.css | cat 1.css - 2.css > out.css So far so good. But I regularly come in situations, where I need to mix several strings, files and even program output together, like copyright headers, files preprocessed by sed(1) and so on. I'd like to concatenate them together in as little steps

I have a long python script that uses print statements often, I was wondering if it was possible to add some code that would log all of the print statements into a text file or something like that. I still want all of the print statements to go to the command line as the user gets prompted throughout the program. If possible logging the user's input would be beneficial as well. I found this which somewhat answers my question but makes it where the "print" statement no longer prints to the command line Redirect Python 'print' output to Logger You can add this to your script: import sys sys

Is it possible on Windows without using WinAPI? You may not remove last character. But you can get the similar effect by overwriting the last character. For that, you need to move the console cursor backwards by outputting a '\b' (backspace) character like shown below. #include<iostream> using namespace std; int main() { cout<<"Hi"; cout<<'\b'; //Cursor moves 1 position backwards cout<<" "; //Overwrites letter 'i' with space } So the output would be H No. You can't without accessing the console's api that is never standard. This code does exactely that std::cout<<"\b \b"; 来源： https:/

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? If I saved the output of this script (i.e. stdout only) so that I could process it later, would that warning interfere with how the output is parsed? Moreover, if output is piped to another process, the warning should show up on the terminal, so the user sees it

Does echo equal fputs( STDOUT ) , or does echo write to a different stream? I've used PHP for a while now, but I don't know very well what's actually happening on a lower level. According to PHP's manual page on wrappers , the answer is No. php://output php://output is a write-only stream that allows you to write to the output buffer mechanism in the same way as print() and echo(). print and echo write to php://output stream, whereas fputs(STDOUT) writes to php://stdout . I did a little test: <?php $output = fopen('php://output', 'w'); ob_start(); echo "regular echo\n"; fwrite(STDOUT, "writing

To redirect (and append) stdout and stderr to a file, while also displaying it on the terminal, I do this: command 2>&1 | tee -a file.txt However, is there another way to do this such that I get an accurate value for the exit status? That is, if I test $? , I want to see the exit status of command , not the exit status of tee . I know that I can use ${PIPESTATUS[0]} here instead of $? , but I am looking for another solution that would not involve having to check PIPESTATUS . Perhaps you could put the exit value from PIPESTATUS into $? command 2>&1 | tee -a file.txt ; ( exit ${PIPESTATUS} )