Month: February 2021

The in-memory file system - how to use tmpfs

Posted by Alex On February 19, 2021

The tmpfs file system is quite useful, as it is incredibly fast and can help reduce the load on your persistent storage (especially useful for those who have Linux installed on a flash drive or memory card). tmpfs is an in-memory virtual file system. The tmpfs tool allows you to create file systems whose content resides in virtual memory. Because...

Error “Cannot load modules/libphp7.so” (SOLVED)

Posted by Alex On February 19, 2021

Some Linux distributions have already started migrating to PHP 8. In some distributions the new version of PHP removes the old one, as a result of which the web server may stop working due to the fact that the files specified in the web server configuration are missing or renamed. Examples of errors you may encounter: httpd: Syntax error on...

Why does VirtualBox lose connection when changing MAC address (SOLVED)

Posted by Alex On February 18, 2021

Virtual machine, after changing MAC address of eth0, the connection does not work. When changing only the last three octets, the situation is the same. Restarting the modem does not give results, there is no filtering by MAC addresses. Why is this happening and how can I fix it? VirtualBox does not support changing the MAC address inside the guest...

VirtualBox shared folder is read-only (SOLVED)

Posted by Alex On February 18, 2021

VirtualBox Shared Folder allows you to easily exchange files between a virtual machine and a real computer. By default, the contents of the Shared Folder are owned by the root user. Therefore, the files in the shared folder are read-only for regular users. The following manual shows how to make the VirtualBox shared folder read/write accessible to regular users. 1....

How to choose the default Java version in Arch Linux

Posted by Alex On February 18, 2021

Several versions of the JDK and OpenJDK are available in the standard Arch Linux repositories (and derivative distributions). You can install one or more of them. Even if you have the latest version installed, some programs may install a different version of the JDK as their dependency - multiple versions are allowed, they do not cause conflicts. After that, you...

bash: finger: command not found in Arch Linux (RESOLVED)

Posted by Alex On February 18, 2021

The finger command displays information about the users logged in to the system, extended information - full name, logon time, inactivity time and some others. By default, the finger command is not installed on many distributions, so when trying to run: finger You may receive an error: bash: finger: command not found In fact, it is not necessary to install...

How to find out which package contains a file

Posted by Alex On February 18, 2021

How to find out which package a file is in Sometimes the name of the required utility does not coincide with the name of the package - this is especially the case when one package contains several programs. As a result, a problem arises - to find a package in which the required executable file or header file is present...

How to view package information in Arch Linux (BlackArch, Manjaro)

Posted by Alex On February 18, 2021

For each package in the system, you can find out such information as: version number, description, developer site, dependencies, recommended dependencies, packages with which there is a conflict, size, etc. The commands described in this post work the same in Arch Linux, as well as all distributions based on it, such as BlackArch, Manjaro and others. If you are interested...

How to downgrade to a previous kernel in Arch Linux

Posted by Alex On February 18, 2021

New Linux kernels bring support for new hardware and new features. But sometimes the kernel causes problems: it is completely or partially incompatible with existing software, especially video drivers often suffer from this, but this can also apply to any other software. A very recent example: NVIDIA drivers are partially incompatible with linux >= 5.9 at the time of writing....

Loading...

X