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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1answer
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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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1answer
23 views
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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1answer
39 views
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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6answers
5k views
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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1answer
40 views
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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2answers
161 views
Long-term archiving + encrypting shell script
Yesterday, I very quickly, in an hour, wrote the very first version of my long-term archiving + encrypting shell script.
I am aware it may have too many flaws, but none of them really prevent it from ...
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1answer
127 views
Lightshot Print Screen key linux handler - Follow-up #1
This question is a direct follow-up #1 of my previous question:
Lightshot Print Screen key linux handler
There were too many errors which I didn't see at the moment and I tried hard to fix them up ...
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3answers
174 views
Calculating linux based octal file permission
I'm applying for a mid level devloper position.
In order to progress to 2nd interview, you need to pass a technical test.
One of the questions was to write a function to work out linux based octal ...
3
votes
1answer
94 views
Lightshot Print Screen key linux handler
I haven't found any Lightshot Print Screen key linux handler publicly available.
So, I decided to write one today. It is a standard POSIX shell script.
I believe there is always space to get better, ...
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votes
2answers
76 views
Goodgame Empire coin collector with random offsets in (almost-POSIX) Bash
Today, my goal was again to improve my POSIX shell scripting abilities.
In one MMO game called Goodgame Empire, there is possible to code yourself a coin (tax) collector. But that's of less ...
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1answer
81 views
POSIX shell script for generating pseudo-random numbers
My today's goal was to further practice POSIX shell scripting.
So, I decided to write the following POSIX shell script for generating pseudo-random numbers.
Any and all reviews would be appreciated.
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vote
1answer
84 views
Shell POSIX OpenSSL file decryption script follow-up #1
This question is the first follow-up of: Shell POSIX OpenSSL file decryption script
Please read it before you continue reading this. Thank you.
I only have one new problem solved and I would like ...
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0answers
52 views
Shell script to manage passwords
To get my feet wet with shell scripting I wrote this "minimal command line
password manager" (aka pwm) taking inspiration from the well known ...
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1answer
96 views
Interactive Linux upgrade script
One year ago, I asked for a review of Simple Linux upgrade script in Bash.
Conditions are slightly changed, and/or more accurate:
Code readability for the code user, making it simple to adjust the ...
2
votes
2answers
44 views
How long a PID has been running (taking multiple inputs)
Tonight I tried to write a POSIX shell script which would allow me to check how long a process is running (via it's ID) and be able to handle multiple inputs:
...
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votes
1answer
261 views
Shell POSIX OpenSSL file decryption script
Tonight, I tried to write a Bash OpenSSL file decryption script. Encryption script will follow in highly similar manner, so I think it's not necessary now.
Let's suppose we have an encrypted large ...
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1answer
43 views
Implementing POSIX file mode library
I implemented a virtual file system library with POSIX file mode representation.
Any suggestions regarding optimization are welcome.
...
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1answer
80 views
Shell script for reading /etc/passwd into SQLite
I want to read 4 columns, namely UID, GID, username and home directory of specific users from /etc/passwd into an SQLite database. I found this to create many ...
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1answer
1k views
C++ wrappers for execv(3)
Calling execv(3) (and similar functions) in C++ can be
problematic. execv expects an array of const pointers to
non-const ...
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votes
0answers
225 views
SIGCONT Handler for terminal application
I'm writing a C++ application for POSIX environment with terminal-based User Interface. I'd like to make my application's UI be consistent between Ctrl-Z and ...
3
votes
1answer
75 views
Showing all programs' man pages
I'm trying to discover useful command line tools in Arch Linux, and it seems one good way of going about that is to look through all of the man pages related to ...
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votes
0answers
29 views
Launch and place application depending on screen resolution
I got fed up off opening a set of applications when I wanted to code. So I decided to read up on AppleScript and came up with the following task for myself.
Open a application of choice on a given ...
5
votes
0answers
99 views
Semaphore implementation by file locking in a bash script
This implementation is inspired by the POSIX functions sem_wait() and sem_post(). It tries to get rid of busy loops in the code ...
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votes
1answer
1k views
Printing infinite loop using pthread [closed]
I'm trying to implement a c program using pthreads which prints "1 2 3 4 5" in an infinite loop. I have used conditional variables and mutex to synchronize the pthreads. I'm able to print "1 2 3 4 5" ...
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1answer
44 views
Split a file into individually allocated lines
This is part of a larger project that is to run on POSIX systems. My concerns with it are the lack of comments, best practices with the filesystem, and naming things. Of course all feedback is great.
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1answer
183 views
Running shell commands in a pipeline
I'm writing a shell in C for Linux and BSD. My code was unreadable before but I did a rewrite and now it is much more readable. The purpose of the code is to create a command pipeline and execute it.
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votes
1answer
63 views
Creating a struct
Mat told me to create a struct
create a struct for the individual commands and arguments. It should
have something like the "executable" name, number of args and arg
list. Create a few ...
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1answer
70 views
C function for copying array into matrix
I want a matrix that can grow dynamically and build up a structure in RAM as input arrives from standard input och terminal (shell). First I tried with a matrix like ...
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1answer
97 views
Shell command line program
I have refactored a for loop into a function. I'm still a beginner at using C utility functions such as strtok, ...
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1answer
81 views
Makefile and main header file for a shell
My main.c includes this header file. Please let me know how I can improve it. I did my best but I don't know much about code conventions in C (I come from Java and ...
5
votes
1answer
103 views
run command pipeline in C
This code parses and tokenizes my shell language command interpreter. I will try and make it 2 functions, one that is the tokenizer and the other that is the rest of the function. Can you find ...
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votes
1answer
101 views
C stack for Linux and BSD
My stack uses char data and is not tested. I use it to save command in a unix pipeline for my own POSIX shell. Maybe you can find a bug or a possible improvement.
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2
votes
1answer
80 views
C main function for POSIX shell
I got a pretty large main function that I want to break up in smaller helper functions. Can you help me suggest what to break out into helper functions? The ...
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votes
1answer
39 views
Handle builtin commands
I've written a small C function to handle the builtin commands of a custom shell that I'm writing in C. Is it better to use a switch instead?
...
2
votes
1answer
40 views
C function to find the less program
I've written a C function to find the program less that the operating system should provide. If lessis not provided, some other ...
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1answer
160 views
Recreation of cat in C
I have a school project to create a program that works the same as the Linux cat. The code works, but I just need find out where I can Improve it or handle errors. ...
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1answer
2k views
Multithreaded MJPG network stream server
I'm a bit of a neophyte when it comes to C++, and so I'd like some feedback regarding a recent project.
The code sits on a Raspberry Pi and streams camera data over TCP on a specified port.
The ...
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votes
2answers
647 views
Colorful output on terminal
I went from manually outputting escape codes in each string to creating a utility struct/class full of static functions and variables that needed to be initialized in source files (static private ...
6
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1answer
180 views
Subset of UNIX standard tar implementation
I recently implemented a subset of the ustar archiving utility as my first year programming one project. I would like to get it reviewed and if anyone has anything to point out.
dir.c
...
6
votes
2answers
142 views
Implementation of the ls command with several options - follow-up 2
I've made more improvements from previous iterations and my own, including:
Added the -n flag (print owner and group IDs instead of names)
Eliminated some ...
11
votes
2answers
849 views
Implementation of the ls command with several options - follow-up
I've made vast improvements to my previous ls implementation, including:
Added new flags:
-g (omit owner listing)
...
18
votes
3answers
7k views
Implementation of the ls command with several options
As part of a past assignment, I've expanded on this implementation of ls to have more options available, including non-standard ones.
It currently supports these (...
2
votes
0answers
68 views
N Processing connect to a single process: Socket Programming
The idea of my program is to use pthreads, semaphores, posix shared
memory, and sockets to create an environment where N processes
(that we will refer to as the children) can connect to a single
...
2
votes
2answers
128 views
Self-written Mutex for 2+ Threads
I have written the following code, and so far in all my tests it seems as if I have written a working Mutex for my 4 Threads, but I would like to get someone else's opinion on the validity of my ...
10
votes
1answer
107 views
POSIX shell compatible and POSIX conforming dirname implementation
The discussion in the comments of this answer made me wonder how hard it would be to write a built-in only version of dirname.
This is what I ended up with but I'm ...
5
votes
2answers
2k views
Fast line-by-line file reader
This is designed for a high performance complex log analyzer. Very simple idea: read a file line-by-line as fast as possible.
I would appreciate any hints what should/could be improved in this code.
...
2
votes
1answer
66 views
Implementing dirpath(3p) and fdirpath(3p) functions
I'm implementing a dirpath and fdirpath functions, which allow to retrieve path from the directory handle (or its descriptor). ...
5
votes
1answer
68 views
Simple file locking wrapper command in C
A simple command that wraps another command, locking a file first. It is similar to flock, just simpler.
...
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vote
1answer
161 views
ttyname() implemented in Go
I'm rewriting GNU's coreutils in Go in order to learn Go better. I've implemented ttyname(3), and I'm looking for a general critique. I can't think of anything in particular I think I did poorly on. (...
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votes
3answers
1k views
Check disk space against a threshold
The below script is one I made to check the disk space on mounted partitions under Debian Wheezy. I tried adding a -d switch to force printing out the used data, ...
