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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How to check your Linux version?

Easy ways to view the distribution and version number of Linux OS.

Distribution version number

cat /etc/*release

For OS release details

cat /etc/os-release

For name and version number of your current distribution

lsb_release -d

To show additional information of current distribution version

lsb_release -a

Linux kernel version number

To shows the version of the Linux kernel that you’re currently using.

uname -r

For more information

uname -a

View everything at once

You have to install Inxi for this

apt-get -y install inxi

Once installed, you can view hardware, host, Linux kernel, desktop environment, and distribution with this simple command:

Inxi -Sz

 

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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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iRedmail/nginx adding website to home server

Two easy steps

  1. Just add a new config with the full “server {}” block in /etc/nginx/sites-available/
    For example, /etc/nginx/sites-available/gene.jinabs.com.conf

    server {
  listen 443;
  listen [::]:443;

    root /var/www/gene.jinabs.com/html;
    index index.html index.htm index.nginx-debian.html;

    server_name gene.jinabs.com www.gene.jinabs.com;

    location / {
    try_files $uri $uri/ =404;
    }
}
  2. Create symbol link for gene.jinabs.com and restart/reload Nginx as follows. 
    ln -s /etc/nginx/sites-available/gene.jinabs.com.conf /etc/nginx/sites-enabled/
nginx -t
systemctl restart nginx

That’s it.

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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