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8
votes
2answers
62 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
39 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
28 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 + ...
0
votes
1answer
26 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
44 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
54 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
30 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
310 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
160 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
2answers
80 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
186 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
424 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
531 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
181 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
115 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
575 views

Parsing ARP cache in C

How can I make this better? ...
3
votes
1answer
73 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
63 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 ...
-2
votes
1answer
36 views
4
votes
1answer
37 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
160 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
60 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 &apos; Please suggest any modifications if needed or any ...
3
votes
1answer
265 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
30 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: ...
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
212 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: ...
10
votes
1answer
169 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
136 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
84 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
130 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
513 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
119 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
209 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
514 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
200 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
152 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
313 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
60 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
994 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
211 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
481 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 ...
16
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
170 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
156 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 ...