Linux is a Free (libre), Open Source, Unix-like operating system.
0
votes
0answers
8 views
Test if get window coordinates [x,y,width,height]
I wrote this code for X11 to get dimensions of a window. It uses XGetGeometry then XTranslate to get the rectangular coords. ...
9
votes
3answers
104 views
Making kexec reboots less painful
kexec is a way for a Linux kernel to directly boot another Linux kernel without going through the usual BIOS startup sequence, which can take several minutes on enterprise servers. The big problem ...
0
votes
1answer
51 views
Is this iptables firewall bash script good? [closed]
I'm learning to use iptables to implement it in my company software. The goal is either to prevent the major attacks and to have good speed transferring files (ssh and ftp). Can you help me to improve ...
6
votes
1answer
31 views
Calculating the harmonic average
In this program I was required to calculate the Harmonic Average using an assembly program with a C driver.
Harmonic mean is define as:
$$ \frac{n}{\dfrac{1}{x_1} + \dfrac{1}{x_2} + \cdots + ...
1
vote
1answer
32 views
Screen timeout/lock script
This is a script I made while having trouble with xautolock and dimming of the screen right before locking it. I would like some tips for making it a bit more robust and to know of any disadvantages ...
2
votes
1answer
52 views
Dovecot user add & delete bash script
I learn BASH scripting occasionally from time to time, now I am working on a simple bash script that serves to maintain dove-cot user database. The general purpose of the script is able to list, add ...
3
votes
3answers
56 views
Copy a directory from source to destination
I wrote a program that copies a directory from a source to a destination, similar to the cp utility.
For this, I used the essential functions:
...
0
votes
0answers
36 views
Speeding up forwarding of Ethernet frames in Python ARP spoof
I've followed a few tutorials on ARP Spoofing with Python/scapy. They all suggest activating the OS IP Forwarding in Linux:
...
1
vote
3answers
407 views
Calculate CPU% by process from /proc/stat and /proc/<pid>/stat
We don't have the possibility to install modules like psutil on some boxes, thus I decided to write a simple script to calculate the CPU percentage by the given ...
3
votes
2answers
173 views
Checking percentage of free memory using top and awk
The following Awk code was created in order to verify if free memory from the top command is less than 20% of the total.
I've noticed that I actually do not need the ...
3
votes
1answer
82 views
Parsing arguments for cd command
This file manager has a code snippet that handles an argument of the "cd" console command. It converts the argument to a valid path, expands ~ and environment variables into the corresponding values:
...
6
votes
5answers
235 views
Mounting multiple partitions on a disk
Is it possible to improve the code of this bash script? ... or should I just use another language? (If so, which one would fit the best the situation, according to you?)
Here is the code (simplified, ...
3
votes
2answers
207 views
Editing /etc/network/interfaces
I am trying to change static to dhcp in the /etc/network/interfaces file and vice versa ...
6
votes
1answer
541 views
Using /proc/stat to calculate CPU usage
Inspired by this question: To calculate the total CPU usage as a percentage
I wrote the following bash script (as an answer) to calculate the CPU usage for a (configurable) period over all CPU cores ...
12
votes
2answers
567 views
To calculate the total CPU usage as a percentage
I have been developing the below method to calculate the CPU usage of a Linux system at a point in time, as a percentage of the total number of cores available in the system.
...
10
votes
2answers
323 views
Minimalistic rmdir
In my eyes most of the GNU stuff is bloated and doesn't really fit my view of how a Linux environment should look like. I have come up with my own minimalist implementation of the GNU Coreutils, but ...
4
votes
1answer
37 views
Script to fix audio level
I need to fix and maintain the master volume in PulseAudio (so that I don't blow up my speakers). E.g. call gfaaudio -v 25 to fix volume at 25%. Is there a cleaner ...
10
votes
2answers
196 views
Parsing of a (Linux) netlink hotplug uevent packet
The netlink service is used, among other things, to notify userspace about hotplug events (e.g. "a device has been connected"). These events come in the form of packets, which follow the following ...
3
votes
2answers
116 views
Group and send all files to filetype folder
I have around ~2M of files in one folder, which I need to manage. So, I want to separate them in groups by their filetypes.
Example:
filenames
...
10
votes
3answers
601 views
3
votes
1answer
76 views
Perl script to check disk usage
I'm looking for input on the code itself and formatting/style. This script parses the output of df -h on a Linux server and emails the user if the usage percentage ...
2
votes
0answers
66 views
Linux-based WiFi AP daemon [closed]
I've written this small Linux-based daemon to create a WiFi AP that should work across various distros like Ubuntu, Fedora, etc.
I'm not a great expert in Python, nor do I know that the various ...
4
votes
1answer
39 views
Generic Makefile
I decided to setup a generic makefile to compile SFML programs, as I'm going to be making a bunch of small apps over the next few weeks playing around with it. I'm still new to writing makefiles ...
5
votes
2answers
1k views
Small bash script to start and stop named services
I've been working on ubuntu since many years but not quite familiar with bash scripting. My development tools involve servers like nginx and apache, the mysql database and beanstalkd. Obviously, I ...
5
votes
2answers
175 views
Benchmarking our LAMP servers with this php script
I've written a small script to benchmark our LAMP hosted servers that assess the performance based on three factors:
Disk I/O
Database I/O (mysql)
Database I/O (sqlite)
The logic is as follows:
...
2
votes
1answer
61 views
Optimizing string replacement program that uses recursion
I have the following string replacement program for a string of size 256:
I am replacing the string
"\'"
with the string
'
Please suggest any modifications if needed or any ...
3
votes
1answer
323 views
Converting from std::wstring to std::string in Linux
I was bothered by inability of C++ to mix cout and wcout in the same program - so I've found this question:
Converting between ...
2
votes
1answer
32 views
IPtables for webserver with ssh
I've had a bit of help but I'm still a bit unsure. I have an nginx webserver with SSH only required. I wrote this rule set based on information I found on the internet:
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4
votes
1answer
141 views
Is there a better way to copy into two different folders on a machine simultaneously?
I am trying to copy files from machineB and machineC into machineA as I am running my below ...
5
votes
1answer
100 views
How to copy files as fast as possible?
I am running my shell script on machineA which copies the files from machineB and machineC ...
3
votes
1answer
221 views
Script for obtaining images from an IP security camera
I am fairly new to Python and programming in general so I hope the code in this post is not too messy. I have the following code which I use for taking images from an IP security camera:
...
11
votes
1answer
171 views
Set of wrapper functions for POSIX signal APIs on Linux
Please feel free to comment on the accuracy/validity of the following wrapper source for processing signals using the new POSIX sigaction API. If you feel I'm doing anything wrong or potentially ...
3
votes
1answer
138 views
Finding world-writable files in local directories only
Over at Stack Overflow I asked how to scan a local filesystem ignoring all remote mount points. I only really wanted a push in the right direction and received it. After clacking away on my keyboard I ...
4
votes
2answers
86 views
Packaging a single-file Python copy-tool
I'm currently working on a very simple one-file project:
Lumix provides the possibility for the camera TZ41 (and others) to load GPS data and tourist information from a DVD to a SD-card so that you ...
3
votes
1answer
134 views
Ping Pong Pi - A ping pong score and serving manager
I have spent a few hours on this code, but think it could be improved a bit. It requires eSpeak to be installed to run the speech synthesis, but the voice can be toggled on or off using the ...
12
votes
1answer
554 views
Linux NASM assembly linked list implementation
Inspired by all of the lovely linked lists lately, I decided to implement one in assembly language. This code maintains two linked lists - one is a free store and the other is the active linked list. ...
5
votes
2answers
121 views
VLC media player watchdog daemon v6
This question is a follow-up to a previous version of this program, which I wrote because I found it annoying that VLC Media Player (which I love) prevents the screensaver from starting after playback ...
8
votes
3answers
211 views
Iptables Lockdown
I have nginx serving files with uwsgi and I wanted to lock my server down just to allow SSH and Nginx to run. This is what I have:
...
9
votes
3answers
547 views
Bash script that updates Intel e1000e driver
I am now writing a small bash script that updates an Intel NIC driver to the latest version from the official website. Is there any way to improve\simplify the script? I want to avoid a lot of ...
7
votes
1answer
205 views
Bash script - automate an upload image + description process on a server
I was tasked at work to improve a system where through a web interface a client, which eventually became us, uploads a bunch of images with descriptions (latter coming from csv files), the images are ...
5
votes
2answers
3k views
Running a shell command and getting output
This is the code I'm currently using to run a shell command on the current machine, intended for use only with GNU/Linux at the moment:
...
13
votes
1answer
154 views
Regular backup/snapshots
A (long) while ago I set up a file server in my basement running Linux. I am OCD when it comes to backups.
I set the server up with (remember, this was a while ago):
disk for OS
disk for 'valuable' ...
1
vote
1answer
332 views
Interactive menu system in Bash [closed]
This is a simple loop menu script that I have for class. The goal was to make a menu with applicable commands.
Menu:
A. Greet me. (Greet the user by their username (using the whoami ...
2
votes
0answers
62 views
Synchronize 3 processes with fork() [closed]
I was given the following exercise in my university:
Given 3 processes:
d1 - print("I"), print("D")
d2 - ...
6
votes
2answers
1k views
Correctness of calculations with struct timespec
I've noticed some discrepancies in timings in our system, and I'm trying to narrow down what could be causing them.
I'm reviewing out time abstraction, and as far as I can determine it's fine.
Am I ...
8
votes
1answer
214 views
VLC media player watchdog daemon
I'm looking for bugs, ways to make it more portable or standardized, improvements of any kind. Seems to do what it is supposed to on my Ubuntu 12.04 PC.
...
6
votes
1answer
501 views
Calculate query coverage from BLAST output
I have a BLAST output file and want to calculate query coverage, appending the query lengths as an additional column to the output. Let's say I have
2 7 15
...
17
votes
4answers
2k views
Recording audio in C
This is a program I wrote as a .wav audio recording library for Linux. It was developed on a Raspberry Pi, so that may affect the dependencies required.(1)
Here ...
8
votes
2answers
172 views
Self-mutating C (x86_64)
As a learning exercise I wrote a short C program that changes the instructions of a function at runtime in order to execute a shell. It's obviously dependent on x86_64 architecture and Linux (for the ...
6
votes
2answers
160 views
Batch rename flac files
This is my first real program in python (and my first real program) and I would like to have input by some more advanced programmers on the code, on the writing style and on the amount of comments (is ...
