Can someone explain how this bash script works? The part I don’t understand is “””:”, what does this syntax mean in bash? test running result: Answer That’s clever! In Bash, the “””:” will be expanded into only :, which is the empty command (it doesn…
Tag: python
Can’t output Python Print in PHP
I’m really stuck on this one, but I am a python (and Raspberry Pi) newbie. All I want is to output the print output from my python script. The problem is (I believe) that a function in my python script takes half a second to execute and PHP misses the output. This is my php script: I’ve included t…
How to avoid defunct python processes in Linux?
With python3 (3.4.3) on Ubuntu 14.04 I have created a Forker class which I use in two different processes to create child processes. Here is the Forker class: In the two different Linux processes I derive from this class and then call e.g. something like: However, I still get a couple of defunct python proces…
how to keep a subprocess running and keep supplying output to it in python?
I am not able to keep alive a tunnel created by subprocess to fire multiple commands. first i tried this to execute a subprocess then i tried this in first case it executes the commands and then exits the gdb making it impossible to keep suplying commands to gdb and in second case it does not execute after b …
differentiate sudo and
I would like to make my user run as sudo and as a normal user depending on his choice.He could use sudo or normal but on not using sudo I have to disable some functionalities to get rid of errors.So how could I know that user as given me sudo permissions to execute or not? I am building my application
Countdown thread RPi stop if GPIO input change
I’m not sure the best way to do this, and is not working for my as it will lock the program on when its asleep not sure how to make it works right… Im trying to monitor when a door open and closes with a raspberry Pi if there door is open for more than x time send some sort
Automating installation of tripwire via python in Linux
I am trying to automate installation of tripwire via apt-get through Python’s subprocess module in Ubuntu Linux. The problem I have is that during the installation process, Tripwire is prompting me for Postfix mail configuration, setting site.key and local.key through different set of configuration page…
Why is idle skipping over f = open(‘filename’ , ‘r’)
I’m writing a program in python and I am having issues getting idle to read my file out. If I use improper syntax it tells me, so it is being read by the compiler but not printing it for the user. Any help would be appreciated. Here is my code. Answer You only put file into variable ‘f’, so …
Executing several commands at once [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago. Improve this question I am trying to write something in Perl (but I’m also happy with Python or PHP to do th…
Wrapping stdin/stdout causes IPython to lose auto completion and history features
I’m working on a script that uses the embedded shelling capabilities of IPython and as a requirement, it has to log all the data from stdin/stdout into a file. For this reason I decided to write wrappers for them; however, after switching out the streams my embedded IPython shell loses its auto completi…