I’m trying to run a docker container that has a volume mounted on it that contains ssl keys/files. I keep getting a file not found error when I’ve triple-looked at all the directories and the error and can’t seem to wonder what is going on. To start off, here’s the portion of my code t…
Tag: linux
subprocess.check_output is too slow on script python but not in interactive python shell
My question is about subprocess. I’m using subprocess to call an external program, I’ve used the check_output() method in which I pass args as list. what I’ve noticed is that when using check_output() from the interactive shell it takes 3 minutes (which is the correct time for executing the …
SSD vs. tmpfs speed
I made a tmpfs filesystem in my home directory on Ubuntu using this command: Then I wrote this Python program: The result: I am confused about this result. Isn’t the tmpfs a file system based on RAM and isn’t RAM supposed to be notably faster than any hard disk, including SSDs? Furthermore, I noti…
Changing linux user password from Golang not working
I need a one-liner from inside a go routine to change a user’s password in linux. The command that WORKS from the command line: But this doesn’t work from my Go program. I have tried substituting other one-liner commands, such as: drm file.txt, touch file.txt, etc. And those all work. The Go progr…
How can I install MSSQL Server in a Python Docker image?
I want to install MSSQL Server in a Python docker container to be able to run unit tests in a CI pipeline. The problem is that the installation keeps failing. How can I fix it? What I’ve tried This gives: Try 2 gives Answer The second example should be: Microsoft doesn’t document it anywhere, but …
How to replace unicode character in file?
I’m reading one file using java and using “u0001” as a field separator. This file is present in linux machine. But when I do head filename, I can’t see “u0001” as field separator in file. May I know please how can I see the field separator in file on terminal ? How to repla…
Deleting the first row and replacing the first column data with the given data
I have the directories name like folder1,folder2,folder3….folder10. Inside each directory there are many text files with different names.And each text files contain a text row on the top and two columns of data that looks like as below Then what i want to do is== at first i want to remove completely the…
not all malloc’ed memory is “heap” and each block is not contiguous in virtual memory?
It seems that malloc calls mmap internally as : so malloc passes NULL as the first argument for mmap as starting address, so the kernel will choose a suitable virtual address for the mapping, which means malloc will not necessarily create a mapping in the heap area(indicated by brk pointer). If this is true, …
io.h not found CLion in Ubuntu 20.04
I am trying to run a c++ code however, io.h is not found. It is shown as Additionally, I am getting a bunch of weird problems (for a code that is rather > 16 years old): or or or or or or I wonder if these are related to io.h not being found. I have CLion 2020.2.3 and Answer Add
How to key press detection on a Linux terminal, low level style in python
I just implemented a Linux command shell in python using only the os library’s low level system calls, like fork() and so on. I was wondering how I can implement a key listener that will listen for key (UP|DOWN) to scroll through the history of my shell. I want do do this without using any fancy librari…