Dev {Tricks}

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How to install Linux Screen utility?

  1. Check whether Screen is installed 
    which screen
  2. If Screen is not installed on your system, run the following command:
    1. If your system uses yum, you can install Screen with the command below 
      yum install screen
    2. If your system uses apt, you can install Screen with the command below 
      apt install screen
  3.  To run a Screen session, enter the screen command. 
    screen
  4. If your session disconnects for some reason, log back in to your server and run the screen -r command. 
    screen -r

    This will reconnect you to your Screen session.

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Move files in the Linux terminal

The mv command moves file(s) from one location to another.

To move a file from one directory to another with mv, remember the syntax below

mv <source> <destination>

For example,

mv example.zip /home

Check whether, it moves example.zip

ls /home

Rename the file as you move it

mv example.zip /home/newexample.zip

Rename a file without moving it to another location

mv example.zip renameexample.zip

Moving a directory

mv exampledir /home

Moving a file safely

mv --interactive example.zip /home

This will ask

mv: overwrite '/home/example.zip'?

If you do not want to manually intervene, use –no-clobber or -n instead.

mv --no-clobber example.zip /home

 

 

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MariaDB Upgrade to the new version | Plesk – CentOS 7 / RHEL 7

By default, CentOS 7 is shipped with MariaDB 5.5. MariaDB 10.x version is a drop-in replacement for MySQL 5.5-5.7.

Automatic method

Note: The script below is applicable only for upgrading default MariaDB 5.5 to the MariaDB 10.5 version, for other cases apply the steps from the Manual Method section. Make sure Obsidian 18.0.30 or later is installed on the server.

  1. Download the attached script and provide it with executable rights: 
    wget https://raw.githubusercontent.com/plesk/kb-scripts/master/c7-mariadb-10-5-upgrade/c7-mariadb-10-5-upgrade.sh && chmod +x c7-mariadb-10-5-upgrade.sh
  2. Execute the script via CLI: 
    ./c7-mariadb-10-5-upgrade.sh

 

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How to Clean the YUM Cache in CentOS

We need to clean the YUM cache to reclaim the disk space used or to fix some errors due to corrupted metadata files.

  • Clean all the cached packages from the enabled repository cache directory. 
    yum clean packages
  • Delete package headers. 
    yum clean headers
  • Delete metadata for each enabled repository. 
    yum clean metadata
  • Clean database cache

yum clean dbcache
  • Clean expire cache

yum clean expire-cache
  • Clean all cached information. 
    yum clean all

Done!

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How to run php file through command line? How do I enable PHP?

For Windows, make sure you have PHP installed and type this into command prompt:

C:\Path\To\php.exe C:\Path\To\Your\script.php

And for Linux/Unix:

php /path/to/script.php
  • Go to Tools & Settings > Updates to start the Plesk Installer.
  • Click Add/Remove Components, expand the Web hosting section, and
  • Then the PHP interpreter versions section.
  • PHP from OS vendor (install)