June 2019

Linux Permissions – Special Permissions

In addition to the usual Linux permissions I have described in a previous article, there is also the possibility for us to set up special permissions for files and folders with one bit.

These special permissions are:

Set User ID (SUID)

SUID option is used for executable files. It tells the Linux system to run the program with the permissions of the owner (owner), not the one who executes them.

For example, if a file is owned by root and has the SUID bit set, the program will run with root privileges and can therefore access any file on your computer – this… read more +

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Linux Permissions – The Symbolic Assignment of Permissions

Switching to another operating system or importing data may result in the failure of accessing your files or folders. This is because your user account lost the property of those files and folders or no longer has the permissions to access them. Also, accessing certain files or folders protected by the system sometimes involves changing their permissions. When you can not read or modify a file or folder on a disk, it means you have to take over its property or modify the permissions of your user account.

I was saying in a previous article that I will also present… read more +

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The default permission setting in Linux: about umask

When a user creates a file, that file has the default properties and permissions. The default owner is, as it is easy to understand, the one who created the file. The default group is the primary group of that user.

The default permissions are configurable. These are defined by umask – the user mask, which can be set using the umask command. This command has an octal value representing the bits that will be removed from the value of 777 for directories, or for files from the 666 permissions when a new file is created (remember, in Linux, directories are… read more +

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Duviz – managing the free hard disk space on Linux

We already talked about FlameGraphs, a graphical tool for finding out free hard disk space in Linux. Today I will present duviz.py, a simple utility in the command-line, written in Python, which allows you to view the space used in Linux distributions.

Characteristics

• Basically, you only need Python2, du and ls, for installing it, which are in any Linux distribution.
• It has only one file – the Python-written duviz.py script. It can be put anywhere and run anywhere.
• It is fast. It does not require waiting time to open the graphical interface.
• Duviz detects the size of the terminal so… read more +

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How cloud hosting improves productivity

A company’s productivity level is a key indicator in identifying its weaknesses. That is why business managers need to make sure they use the most effective strategies and at the same time the least costly. Cloud hosting can be a good solution for such situations. The advantages that hosting solutions bring to companies are often obvious, but its impact on productivity has often been ignored. The following list highlights the most relevant ways in which cloud hosting marks the level of enterprise productivity. Cloud hosting represents the future of hosting and more and more businesses will integrate the cloud into… read more +

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Things you do not know about Linux

Linux is one of the most popular operating systems on the market. Created more than 25 years ago, Linux has often been considered inappropriate for all users. However, contrary to expectations, the system is widely used. Although it has become increasingly known, some aspects of the operating system remain less well known even nowadays.

• The best supercomputers in the world use a Linux distribution as an operating system. In the top 500 supercomputers, 498 computers use this operating system, and the most optimistic predictions for the year 2019 say that Linux will eliminate all top competitors;
• Linux is free…. read more +

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Zabbix integration with Slack

I want to be clear from the beginning, I am not going to write about Slackware (the distribution) but Slack (the platform/client chat).

Zabbix is a solution for monitoring applications, networks and servers. With Zabbix, you can monitor multiple servers at a time using a Zabbix server that comes with a web interface (which is used to configure Zabbix and has system graphics) and Zabbix agents that are installed on the systems that are going to be monitored. Zabbix agents deliver the desired data to the Zabbix server.

Slack – perhaps the most useful application when you are a manager and… read more +

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The cloud computing weapons – which are they and how they can help your business

The IT technology is advancing so fast that it is very easy for practitioners to lose in this mix of information. It has been demonstrated that traditional data storage methods no longer work because they are more expensive and therefore less manageable. Traditional methods require expensive equipment for a well functioning, as well as an expert team to install, configure and maintain them.

Cloud computing services have quickly become the largest revenue generator for today’s top software companies. Cloud solutions greatly reduce server, software, hosting, maintenance, or technical staff costs. Costs are lower because there are not enough resources to… read more +

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Permissions for folders and files in Linux

To begin with, it should be noted that in a UNIX system (also applicable to Linux systems), anything that is not a file then it is a process. Linux does not make any difference between a directory and a file, because the directory is nothing but a file that contains the names of other files. Almost everything we encounter in a Linux system is a file; if it is not a file then it is a process.

File types in Linux

Directories: files that contain a list of other files;
Special files: the mechanisms used to enter commands and return responses (most… read more +

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What is LinSSID

A Wi-Fi analyzer is just a conventional computing device (laptop, tablet, or smartphone) with installed software that lets you take a closer look at the wireless networks in your area. This app can tell you not only the strength of your network signal. , but also information about the power and the operating channel/frequency of other networks in the area. These are the key data because sometimes a blind spot may appear when two networks interfere with each other.

Linux laptops are not common, but if you have one, you can try LinSSID, a free Wi-Fi analyzer available on Sourceforge. LinSSID… read more +

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