I’m trying to set up a React Native project using GenyMotion and Expo on Ubuntu. However, when I click the ‘Device’ button in Expo to package the app onto the emulator, I get the following error in the Expo console: I initially tried to use React Native through Android Studio, with the inbui…
Tag: linux
jq array of hashes to csv
So I have a data source like this: I want to get output like this: Using a fake parameter seems like a hack and then needs to be clean up by sed to work. How do I do this with just jq. Answer Instead of trying to put literal newlines in your data, split the data into separate arrays (one
Draw table in C — like table on manual page of Linux
I want to make nice tables like you see on some manual page of Linux documentation in C programming language. Is there any library or functions to create a table like them. For example a table that you can find on man syslog like the following, produced by running man syslog: Answer You can take a look at the…
why does my ffmpeg process wait forever without stdin parameter to subprocess.run?
I am using the python subprocess module to call ffmpeg like this: This works fine. An example call: What I want to know is why it doesn’t work when I omit the stdin parameter. In this case the ffmpeg process waits forever iff I start my program as a background process in the shell. Running in the foregr…
How can I find all syscalls that have to be whitelisted for seccomp?
I have an existing program that I would like to sandbox using seccomp (v2). How can I find what seccomp rules I need to allow for the program? I’ve tried adding seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(…), 0) for all syscalls printed by strace -xfc a.out, but apparently that wasn’t enough, s…
Python does not find custom installed modules when running from a cronjob
I’m trying to set a python script to run every two minutes using a cronjob, the crontab line is below. The python script is called by a shell script, script.sh, posted below. This python script starts a selenium webdriver, gather some data and saves it to a csv file. A snippet is also bellow. crontab Th…
Serial port hangs on close()
I developed this simple kernel module, which emulates a serial port by using a FIFO queue and a timer (read from hardware : out from the queue, write to hardware : insert in the queue). Source code is shown next. Then, I wrote a simple test-application which configures the port settings (baud rate, parity, st…
Unable to substitute a custom variable in Authorization header value in curl
I am trying to use $timestamp and generate hash. I see $timestamp value is not getting assigned and it’s always same. My request:– Output[Request Authorization headers] 20180701T12:33:56+0000 is the correct value which i want to get substituted in ‘$(echo -n $timestamp’ but it’s …
Bash Script is not working [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 4 years ago. Improve this question When …
How can I make Linux system calls from a C/C++ application, without using assembly, and in a cpu-independent manner? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 4 years ago. Improve this ques…