Questions tagged [posix]
POSIX is an acronym for Portable Operating System Interface, a set of standards defining programming APIs and utility behavior for Unix-like operating systems.
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improved "tee" utility
We have modified the tee program with your suggestions from the previous pull request. Did I implement well? I would like to optimize the program even more, what ...
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Implementation of the "tee" utility program
How can I optimize the program? To make it more optimal? The program should be more optimal in terms of source code, compiled executable size, memory usage, speed, bugs etc. Please criticize the ...
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tee: copy standard input to both stdout and a file
I implemented the tee command from linux. The program also handles the -a option for adding text to the end of a file if it ...
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A POSIX getdelim() and getline() implementation for MSVC
Tired of always having problems in reading arbitrary length lines from file under Windows, I tried to write a POSIX getdelim() and ...
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change file attributes on a Linux file system with chattr
I am reading the book The Linux Programming Interface and I have reached the exercise in which the implementation of the chattr command in C is required.
I would ...
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A multithreaded implementation of the 'which' command
Here is an implementation of the 'which' command which can tell where programs are located.
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Function that behaves as dup2
I am reading the book Advanced Programming in the UNIX Environment and I have tried to solve the following exercise: Write a function that performs the same actions as ...
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Retry read/write until all bytes are transferred or error occurs
Currently I have a wrapper function for the read/write system calls, the purpose of which is to eliminate partial transfer ...
user256024
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Whose `git` is it anyway?
A Posix function for finding the nearest parent file. For example "what .git/ am I working in?" or "is there an .npmrc affecting npm from this path?&...
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Editing system files in Linux (as root) with GUI and CLI text editors #3
One year and a half ago I posted the second iteration of this script for a review here:
Editing system files in Linux (as root) with GUI and CLI text editors #2
Since then, it has been "...
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UNIX calendar(1) in C
This is a simple implementation of the calendar(1) utility included in some UNIX systems (all BSDs have it, GNU has not). I do not have much experience with ...
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Posix signal implementation
My hobby is Unix-like operating systems.
Recently I began writing my own sel4-based Posix compliant OS. Here's the code for internal signal handling functions which presents a kind of backend to help ...
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Installing packages if they don't exist in Bash
This script simply installs the chosen packages if they're not present on a Linux system using the apt package manager. Notes on improvements of any aspect are ...
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Updating text in a HTML document with Bash
This is a small script to update my project's README file. Notes on improvements from any aspect are welcome!
Here is the document it updates.
readme.sh (Executed like so: ./readme.sh)
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The Blacklist v2
This script gathers domains listed from sources in this JSON file and compiles them into one text file. Text files that have a similar key under the whitelists ...
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Pomodoro timer daemon in C for BSD systems
I wrote a Pomodoro timer daemon for BSD systems in C (may work on Linux with -lbsd).
The server uses poll(2) and sockets to communicate with the client and to ...
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Efficiently read a file into a (C) string using POSIX APIs
Exactly what the title says, this is a C++ class that attempts to read a file into a null-terminated string as efficiently as possible, using POSIX APIs. Obviously this is not intended to be portable ...
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Recursively list directories
How does the following look to list the directories on a posix system? This is actually the first piece of C code that I've written where I've actually been able to use for a real-world problem!
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C++ TcpServer class
I have a class Tcp_Server that implements a TCP server. This is the base class for the other types of servers available in my program. For example ...
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Attempt on basic input validation and functional programming in a POSIX shell
In spite of all the POSIX shell disadvantages, I am still sticking with it and I love its portability.
Recently, I was searching for a way of code re-use, which turns out to be structured programming ...
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Log file name adjustment
I have the following code that takes user input "path" and adds the current time into the filename after the name part and before any extension (if it exists).
It seems a little hacky to me ...
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*nix, *bsd, etc basic `tput` color setup
My goal with the below piece of POSIX shell code was to address the more platforms the better with shell tput colors. With this code, I now start all of my scripts, ...
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Regex to match each line in a file, with windows and/or linux line break included, even for missing line break at EOF
My requirement is to match each line of a text file, including the line terminator of each, at most excluding the terminator of the last line, to take into account the crippled, non POSIX-compiant ...
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Implementation of GNU shuf(1) now supporting nul characters
Some time ago, I implemented shuf(1), but it had an issue: it ignored nul characters in the input.
This new version tries to solve this problem (but uses the ...
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POSIX + BSD-extensions implementation of shuf(1)
I implemented GNU shuf(1) in C using POSIX system calls and some BSD extensions. You must compile it with -lbsd.
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sudoedit_enhanced written POSIX-ly (readlink possible problem?)
sudoedit_enhanced written POSIX-ly challenge
While creating sudoedit_enhanced POSIX (apart from ...
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POSIX shell function to "dump" all given arguments
My today's idea was to create a POSIX shell function to dump all given arguments, typical use would be to call it from a fucntion, where you already know some arguments are not well set (empty; not ...
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Light task-processing systems with zero dependency for Linux systems
I made a prototype for a task processing systems.
Architecture
Worker - is a entity that is processing one-by-one tasks for the same processor.
Processor - (also: executable, app) executable file (...
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Editing system files in Linux (as root) with GUI and CLI text editors #2
This is the second iteration of this question
A note to start with: the first iteration of this question can be found here:
Editing system files in Linux (as root) with GUI and CLI text editors
As ...
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Safer & simpler allocation functions and macros
I wrote a bunch of functions and macros for safer and simpler allocation. They are documented in their files.
Disclaimer:
The library requires POSIX extensions, GCC extensions, and LIBBSD ...
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Generic circular doubly-linked list v2
I've improved, with help of the answers and comments, the linked list that I posted yesterday. It's been through a lot of changes, and is much more useful and safe now.
I documented the linked list ...
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Bash script to scp specific, most-recent files from remote server
I'm writing a helper script that I wish to be able to share with my co-workers. We all work using macOS Mojave, but all have their own shell configurations. For example, I actually use ZSH and bash 5....
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Correctly applying the "rule of five" to a RAII socket wrapper
I was trying to create a simple RAII wrapper with rule of 5 for a TCP POSIX socket. My aim was to try learn how to apply rule of five in different situations, but this one was somehow tricky.
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POSIX+ implementations of echo(1)
Ever wanted a strictly conformant echo(1) implementation on your system? Wait no more: I've built it!
What is it?
My first large-ish body of C code in a while.
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Console arkanoid in C
On an Internet forum a person came with their homework, to write Arkanoid in a console - it seemed they wanted someone to do their homework for them so I did not respond. However, I found the task ...
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Custom malloc implementation
I have a malloc() implementation that relies purely on mmap. I'm fairly sure that it doesn't overwrite any of the internal ...
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Bash Code to backup the history file in Linux [closed]
How is the logic, efficiency and can it be improved?
This is a snippet from my .bashrc file, I just wrote it.
The code is supposed to do this:
Backup my ...
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POSIX shell function for asking questions
I've written a tiny function for asking questions intended for my POSIX shell scripts, where I often need user input.
The function takes 2+ arguments, where:
Is a string containing the question.
, 3....
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batch add users to nextcloud on docker with csv
I have a working script that will batch add users to an instance of nextcloud running on top of docker. This version is the result of changes made after asking this question.
I guess I'm looking for ...
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Editing system files in Linux (as root) with GUI and CLI text editors
My intention is to POSIX-ly write one generalized function for running various text editors I use for different purposes through sudoedit, i.e. editing files as ...
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Is device mounted? Both UUID and device names accepted
I am trying to write is_device_mounted script, which in turn will serve a greater purpose in my home Linux system.
It does not even have an error reporting ...
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C Recursive Opendir Wrapper to Sort Directories First (ascending/descending)
A recent post on StackOverflow about a recursive directory listing which produced an unsorted mixed file/directory list, sparked the stray thought of "What would it take to write a wrapper for the ...
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Lock file and interrupt signals in POSIX shell script running indefinitely
This script is running indefinitely as the Linux background process.
I have put an enormous effort to make this POSIX shell script containing an infinite loop shut down tidily along with the ...
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POSIX-ly finding a specific Java process
In this code I find a list all of the running java processes and give the below function a name to look for, it will do its best. But since I find my approach a ...
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Easy to use code preparation script for CodeReview questions
We all face questions that forget to include their code. Sometimes all of it, sometimes only parts, that make the rest of the question unfortunately incomplete and therefore off-topic.
What if it was ...
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Detecting the total amount of RAM installed on a hardware from a Linux system using a POSIX shell script
Today, I gave myself a small task of detecting the total amount of RAM installed on a hardware from a Linux system using a POSIX shell script. I ended up using ...
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Shell POSIX OpenSSL file decryption script follow-up #3 (final)
From original very simplistic code: Shell POSIX OpenSSL file decryption script
I learned a lot both from the first follow-up review, and the second one as well, many thanks!
I just need one final ...
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Shell POSIX OpenSSL file decryption script follow-up #2
This question is the second follow-up of: Shell POSIX OpenSSL file decryption script
The first follow-up was: Shell POSIX OpenSSL file decryption script follow-up #1
Both of which have proven very ...
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Create a C style char** from a C++ vector<string>
I am dealing with some older C style APIs, like Posix execve that take a char**. In the rest of my code, I prefer to use a ...
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Generic error handler function for POSIX shell scripts
Intention
I came with the idea of generic, portable, highly reliable, and further customizable function for Shell scripts, written in POSIX, for error handling.
Purpose
The function shall find out, ...
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