Updated question: my flask web page is working well, however i am currently editing my 3rd page and its doing something i cant understand. when i click on the third tab of my web app, the URL goes localhost/DC2/DC5, whereas i need it to go localhost/DC5. Im not sure why its jumping through the first page. Her…
Sending payload with sigaction
how can I use sigaction such that a process can send a payload with the signal that can be retrieved by the receiving process? Answer You use a realtime signal (SIGRTMIN+0 to SIGRTMAX-0), so that the signals are queued, and you have a much lesser chance of missing one. (Standard signals are not queued, so if …
Storing awk manipulation in variable
I have two text files in tab delimted format like following. file_1 file_2 these two file contents were stored into two different variables. Now I would like extract the lines which has “+” symbol in column 4 and store it in the variable and later print it. But it throws me error message: Here is …
Visual Studio 2015/Linux extension produces a “collect2 : error : ld returned 1 exit status” with Cygwin
I am currently trying the Linux Extension of Visual Studio 2015. I plan to have several target machines using various distribs. So far, my testing machine is a Windows 7 with an up-to-date Cygwin with all needed packages (openssh, g++, gdb…) installed. The test I’m conducting consists in a very si…
dlopen fails in chroot
I’m attempting this: I have an environment defined in /chroot/debian6.0/ where I have bound some directories and created other ones. One is libs/ which contains the library libOne.so and its dependencies So: This library has been compiled in the chroot environment, and I want to open it with a process r…
How Python reads a file when it was deleted after being opened
I’m having difficulties in understanding the concept of how Python reads a file when it was deleted after being open’ed. Here is the code: Text and binary modes give the same result. I tried this also for big files with more than 1Gb size and they were also read after being deleted. The operation …
Isn’t it possible for a file to not be visible for other processes?
I have a Java application which is invoked from a shell script and creates a file, then writes some content to it. It works something like this: The resulting file will be quite large (up to 100MB). The issue is that opening the FileOutputStream creates an empty file and makes it available to other processes …
Linux – Do a command repeatedly for a certain length of time
I know what the command watch -n does. I would like to do something like the following: Essentially I want to repeat a command every 5 seconds, then stop after 30 minutes has passed. I’m missing the stop 30 minutes part. What command should I use to achieve this? Thanks. Answer Use timeout:
PostgreSQL 9.5 doesn’t start after reboot with systemd
I’m having a problem with PostgreSQL 9.5+173 on Ubuntu 16.04 and I happened to stumble across the following threads in my research that somewhat describes the behavior I’m seeing: https://www.postgresql.org/message-id/CAFyxdeT%2B%3Dx-d0oNbFPoe%2B4xnt0Qdfi%2BzAEn%2BrQmEK0AZbJFRtg%40mail.gmail.com h…
I remove proxy from git but still showing the error how to resolve it?
My git is stuck whenever now I try pull,push or clone I remove the proxy but still no positive response from git. Last time I used this command for proxy: I try these commands: but still getting this response when I clone the repository or want to pull or push! Answer After using these comands These two comma…