Linux is a free (libre), open source, Unix-like operating system.
3
votes
2answers
47 views
pthread_cond_wait() based multithreaded Linux daemon skeleton
I'm trying to design a multithreaded daemon for an industrial automation related project.
The daemon will be using a number of 3rd party libs like MQTT, mysql, etc..
My idea is to have worker threads ...
-1
votes
1answer
47 views
Server listening for program sockets
Essentially I have a server that will be listening for sockets in other programs seeking a connection:
...
4
votes
2answers
137 views
Reverse all lines in a file
The script below should open a file, read and reverse every line, then overwrite the source file.
...
3
votes
2answers
56 views
System backup on Linux - follow up
This is a follow-up to System backup on Linux. I've done a lot to my script since I asked my first question and I think I could improve a lot while doing this. The script still does the same, only a ...
6
votes
1answer
118 views
System backup on Linux
I've written this Python script to make regular backups of a Linux server. It works pretty well except that the script sometimes backups files more than one time, which is pretty strange and I don't ...
2
votes
2answers
30 views
Split redirecting to multiple files in bash
A function mycommand which runs command and:
Gives me three log-files which are:
*.stdout.log: everything from ...
6
votes
1answer
107 views
Basic Linux daemon
To help myself relearn C++, I'm looking at writing a simple proxy. At the moment I've got a logger, command line argument parse and simple daemon (it does nothing beyond logging). Next I'll be looking ...
1
vote
1answer
91 views
Get network interfaces on Linux
I wrote this in order to get a list of network interfaces on Linux. In the past, I have used publicly available methods from, say, ActiveState, which uses ioctl and was annoying to get working under ...
4
votes
2answers
273 views
forever.sh - should keep a process alive forever
This script's only responsibility is to keep a process alive. Forever.
It's sole dependencies shall be bash and coreutils. I'm ...
5
votes
1answer
22 views
Shell Script Audio Logger
I created my first shell script. It's an audio logger that runs on the hour for an hour and restarts. Although if it is started within the hour it will only run until the end of the hour.
I've added ...
3
votes
1answer
38 views
GRE Tunnel Script
I've made this script above for GRE Tunnels and I'd like to know how I can improve it.
Also, at the bottom, you'll see "Do you want to forward more ports." I want an easier method of asking this and ...
11
votes
1answer
81 views
Callback in Linux kernel driver in order to hide device's low-level protocol
I'm am writing a Linux kernel driver for HD44780 LCDs connected via I2C bus. In my last change I tried to decouple low-level code (which talks to the device via I2C) from device's logic (printing ...
2
votes
2answers
93 views
A basic C Shell for Linux
I have written a basic C Shell. It features the builtins cd, programmer, ver and ...
9
votes
3answers
525 views
Daemonizer in C
I am aware that the malloc is a potential memory leak, but with an execvp coming, and that never returning.
The purpose is to ...
6
votes
3answers
339 views
Locating a PID based on an IP address and port
I wrote a simple Python app that is given an IP address and port and the app then finds the PID listening on that IP:PORT.
I would like to hear constructive criticism regarding the bellow code.
...
8
votes
2answers
122 views
Backup Linux system to web
First I create a .tar of the root directory with all the file permissions saved and excluding all irrelevant directories (are these the right folders to be ...
3
votes
2answers
81 views
Assessment of client-server program source code
Can you assess source code of my client-server program?
I would like to get an advice about design, code security etc.
Thank you very much.
The program does the following:
Show files in ...
4
votes
2answers
164 views
Using sed regular expression to extract domain name from file
I'm learning regex with sed to extract the last field from file named "test". The method I'm trying gives desired output.
Please suggest if this method Im trying is ...
7
votes
1answer
73 views
Adding support to Busybox vi for reading file from stdin
I am writing a patch for Busybox's implementation of vi, the classical command line code editor and predecessor of vim. It can ...
3
votes
1answer
50 views
Remove line numbers from shell history
I want to parse Linux history output and the commands parts only (without numbers):
...
7
votes
1answer
66 views
Detecting two keys pressed in quick succession
My computer has been having this issue where when I press a key, two key presses get registered. The goal of this program is to detect the time delta between the two keys so that I can set an ...
4
votes
1answer
47 views
Ruby script that deletes servers from Red Hat Satellite
This script uses the Red Hat Satellite v5.4 API to delete servers which are read in from a file. The servers are listed in the file by hostname but the Satellite API deletes servers by ID number. The ...
1
vote
0answers
105 views
Defining a char device driver protocol over uart at kernel level
My aim is to write a blocking char driver that return to the user space a complete protocol message from the kernel uart driver.
Protocol description
I'm fighting with a very bad protocol, called ...
2
votes
2answers
74 views
Set-uid root program that runs a program as the user “restrict” (follow-up)
See Set-uid root program that runs a program as the user "restrict" for context.
I've written a very short program that is intended to run the program specified in its arguments (...
0
votes
1answer
31 views
Set-uid root program that runs a program as the user “restrict”
I've written a very short program that is intended to run the program specified in its arguments (argv) as the user named "restrict" (which exists). I want to make ...
4
votes
1answer
70 views
Remote control receiver for robot control
I have built an RC car and attached a Raspberry Pi to it - in order to control it, I wrote some Java code to listen to commands over the network and make the car move accordingly.
...
4
votes
2answers
54 views
Bash script to replace substrings in a file with strings
I am an editor of the Funtoo Linux wiki and was looking to create a shell script that would help to ease the updating of pages on the wiki that use old tags by replacing certain deprecated tags with ...
4
votes
2answers
56 views
Return from the parent process code or common code
In this program, the parent process creates a child process, then the child executes ls -l. The parent process waits for the child process to complete and then ...
4
votes
1answer
60 views
Restart Services Automatically
I have been working on a script that automatically checks on the state of 2 services that I require to be running 24/7 on a server that I manage.
The script works as I need, but I would really like ...
4
votes
2answers
101 views
Installing and removing kernel module RPMs
First, the script checks to see if it is installing two kernel module packages or removing them by looking at the first parameter. If no parameter is provided it complains and exits.
If installing, ...
3
votes
1answer
70 views
Append the first half of the first line of /etc/hosts to a conf file
I have to edit a config automatically before starting a service in a docker container (a storm supervisor), and I want to append something like this in ...
5
votes
1answer
208 views
Extracting emails from a file and writing them to another file
The code below works fine for me. Is there any way that I can improve this code more? Note: delimiter is single whitespace only for email address.
getmail.py
...
3
votes
2answers
31 views
Changing filename and copying in bash
I wrote a script which changes names of last downloaded songs and copy them to music directory. Can it be written better?
...
3
votes
1answer
46 views
Ordered doubly-linked lock-free list
I'm implementing a lock-free ordered doubly-linked list based on heavily modified paper entitled Split-Ordered Lists: Lock-Free Extensible Hash Tables by ORI SHALEV. My main concern is correctness of ...
1
vote
1answer
38 views
Alert on partition growth [closed]
I have a script that alerts me via email when a partition grows past a defined threshold in one hour. My script is run from cron hourly. Everything seems fine for 99% of the time, but occasionally I ...
1
vote
1answer
91 views
Writing binary data to file in Linux
I'm trying to learn C++ and I would interested in how I could write better code. The code should be independent of the architecture it is running on. What I want to do is writing some binary data to ...
5
votes
1answer
392 views
Probe request capturing with Scapy
This is a probe request packet sniffer using python/scapy. It sniffs Dot11ProbeReq packets and display the ssid, MAC of device and manufacturer name from the probe requests. Can also output the data ...
4
votes
3answers
96 views
Bash script that checks if font is installed and installs it if necessary
This checks if a font is installed by using fc-list and grep. If the particular font is not installed, it offers to install it ...
4
votes
1answer
142 views
A simple C++ trading system demo
I need my trading system demo reviewed. It implemented a simple system which parse the trading flow (logged in file) of different trader and calculate some important feature.
The code is listed here ...
2
votes
1answer
32 views
Bash script that checks for package dependencies and installs them if necessary
I'm new to Code Review and new to writing bash scripts as well. I was wondering if I could get someone's advice on a part of the script I'm working on.
Intended purpose of code
Check if a package ...
3
votes
1answer
72 views
Simple Linux pipeline
I've compiled a simple Linux pipeline and using my C style and modularization that I will use for my own operating system. Do you have something to say about this code (partly taken from SO)? For ...
1
vote
0answers
79 views
Local branch update script using Git and PHP
I'm using Git and PHP to create an update script which is sync local branch and the master. It checks about new updates, and if yes, it proceeds to the Git pull request and any response got from the ...
-6
votes
1answer
49 views
Reading temperatures from /sys
I have this code which is working fine but I would like to use Java 8 NIO in order to optimize the code performance.
...
3
votes
1answer
99 views
gcc installation script for Centos6.6
I have written this script to install gcc (here in version 4.9.2) on Centos6.6. I am only interested in C and C++ support.
Please comment if this is any good and can I make it better before I get the ...
4
votes
1answer
99 views
Multipurpose command-line utility to manage a web application
I'm creating a command-line tool which is supposed to work on both Windows and Linux OS. It will be used to manage our application - start, stop, deploy etc.
We have it in bash scripts now (and it ...
5
votes
1answer
37 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.
...
4
votes
2answers
452 views
Bash script to send emails when web server does not respond
I've made a simple bash script to check if a web server responds, and to send emails to a list of addresses if the website is down. Any suggestions as to how to improve it/ edge cases that I missed/ ...
3
votes
1answer
249 views
6
votes
1answer
574 views
Fast Thread- and multiprocess-safe file operations in python under Linux
I'm trying to implement an alternative to python built-in open(), but safe for use in multi-threaded and multiprocessing environment. I'm using advisory locking, ...
4
votes
1answer
59 views
Simplifying a Makefile
I have a makefile like the one below and I am trying to simplify it. I know I should be assigning variables to cut down on repeated things but I am still confused as to how to properly simplify this ...
