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Nginx: how to set default server
August 01, 2016
Sometimes it's conveniently to set up default server, that gonna try to serve request by default. Originally, if your server got a request by IP address (for example) and can't get any requested hostname, it takes first server description from your config and tries to serve request with this server.
You can change this behavior. It's really easy. Just use default_server parameter, like this. 
server {
    listen      80 default_server;
    server_name example.net www.example.net;
    ...
}
linux


How to check GMail inbox from command line
August 01, 2016
First of all we have to create an application password here.
Then, create bash script like this one: 
#!/bin/bash

# crontab example line
# */4 * * * * /home/username/check-gmail.sh 

export DISPLAY=:0

username="your-email@gmail.com"
password="your-app-password"

/usr/bin/curl -u $username:$password --silent "https://mail.google.com/mail/feed/atom" | \
  grep -oPm1 "(?<=<title>)[^<]+" | sed '1d' | \
  while read line; do 
    /usr/bin/notify-send -i xfce-newmail "You've got new mail!" "$line" -t 5000
  done
After that, you can add this script to your cron using crontab -e. As you see, notify-send is used here to display system notification (XFCE, in my case) for each new mail received, in your case you can change that in the way you like.
Original note here.
linux


Debian + XFCE xscreensaver alternative screen lock
April 06, 2016
Step one 
sudo apt-get purge xscreensaver xscreensaver-data
Step two 
sudo apt-get install light-locker
Step three 
# which light-locker-command 
/usr/bin/light-locker-command
Step four
Bind global hotkey (keyboard settings for XFCE case) for command /usr/bin/light-locker-command -l
Based on this solution
linux


Debian: Decoupling VLC volume and system volume
March 31, 2016
Step 1 
vim /etc/pulse/daemon.conf
Then find and change line with flat-volumes to 
flat-volumes = no
After that we have to restart pulseaudio without restart 
pulseaudio -k
pulseaudio -D
Source solution note is here
linux


How to extract .tar.xz to selected folder?
March 04, 2016
It's simple 
tar -xJvf archive-file.tar.xz -C ~/dest/folder/name
Also simple for regular .tar.gz files 
tar -xzvf archive-file.tar.gz -C ~/dest/folder/name
linux ubuntu


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