Linux is a Free (libre), Open Source, Unix-like operating system.

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-3
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1answer
28 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
36 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 ...
2
votes
0answers
74 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 ...
4
votes
1answer
24 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
144 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
93 views

Parsing /proc/net/sockstat

I have this very simple code which is used to parse values: ...
5
votes
1answer
49 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, ...
3
votes
1answer
33 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 ...
4
votes
2answers
36 views

Bash CGI Upload File

I'm using the following Bash CGI to upload a file: ...
1
vote
2answers
27 views

Repeatedly fetching a URL until the response contains “state: INIT”

I am working on a project in which I need to make a URL call to one of my servers from a bash shell script. http://hostname.domain.com:8080/beat After hitting the above URL, I will be getting ...
5
votes
3answers
55 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, ...
3
votes
2answers
52 views

Number of files with specific file size ranges

I am trying to write a script that will traverse through my directory and sub directory and list the number of files in a specific size. For example, 0kb-1kb: 3, 1kb-4kb:4, 4-16KB: 4, 16kb-64-kb:11. ...
10
votes
3answers
127 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
113 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 ...
12
votes
1answer
119 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
42 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
125 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
62 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
84 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
979 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
240 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
88 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
236 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
300 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
1k 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
893 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
327 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
278 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
125 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
740 views

Parsing ARP cache in C

How can I make this better? ...
3
votes
1answer
137 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
77 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
47 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
2k 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
338 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
72 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
637 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
33 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 ...
6
votes
1answer
119 views

Copying files as fast as possible

I am running my shell script on machineA which copies the files from machineB and machineC ...
3
votes
1answer
291 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
192 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
156 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
90 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
144 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
688 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
127 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
233 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. ...
10
votes
3answers
643 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 ...