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How to reproduce “Too Many open files” error in Shell

Assume that my open file limit is 1024 per process, Then how to reproduce Too Many open file error in shell script? I tried above, but it opens 10 files in 10 different processes. Answer You can use ulimit -n to set the maximum number of open files to a low number, and then open up more than that number

POSIX shared memory model

Is there a memory model specification for POSIX shared memory (across processes)? I’m hoping that there’s something to comparable to the C++ memory model, in order to answer questions like the following: Is there a definition of a data race? Are data races undefined behavior (as in C++)? Is there …

A confusion about the alias area of bashrc file

I want write my own alias called oepnserver. The functions of the oepnserver are: show my ip address use python module to start a server on current folder. The detailed code is listed below: When I type oepnserver, my terminal only shows: However, my expectation was I also try to use the ifconfig wlan0 |grep …

Django – can’t run server as sudo

I’m creating a soft AP in order to configure my raspberry wireless from it. I alread have an script to create a hotspot, a dhcp server and now i need to run a django app using sudo. (Yes, using sudo. I’m waking up my django server from my python script, and the script needs to run as sudo) I&#8217…

Executing Java Mission Control from command line

I have copied the JMC 7.0 binaries in linux. Any idea on how to start the application from commandline or do we need GUI to be enabled in linux ? Thanks, Naveed Answer There is no headless mode of JMC, but you can start a recording and open it from the shell.

find and copy command not working in bash

This line works in the terminal, but not in a bash script: cd /home/me/Downloads/Data/$currentYear/$currentMonth/$currentDay/ find . -name ‘*.wav’ -exec cp {} $tempfolder ; I’m trying to copy all the WAVE files from all the sub-directories to a temporary folder Answer So, I solved it. Turns …

Get full path of currently playing file in mpv

Is there a way to get the full path of the currently playing file from mpv, after mpv has been launched? I saw this question but it doesn’t show how to get properties, just how send commands. Edit: by ‘get the full path’, I mean from programatically; from another program or a terminal, not b…

“Loose” inter process communication

I have two programs (namely dwm and slock). I want to trigger a function in dwm depending on events happening in slock and vice versa. The requirement is that both should be independent and run without the other program and also work together. What is the easiest and/or the best (most efficient) IPC solution/…