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Compress a PDF

Source

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

• -dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)

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detectlanguage.com

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If you get an error using serverless

Source

Error: spawn /home/imin/.serverless/bin/xdg-open ENOENT
      at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
      at onErrorNT (internal/child_process.js:469:16)
      at processTicksAndRejections (internal/process/task_queues.js:84:21)

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If you want to play audio with a cron job

Source

Get your user ID.

$ id -u <user_name>
1000

Then add the line below to crontab -e.

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from vfs_appointment_finder import utils

class TestUtils:
    
    def test_initialize_firefox_webdriver(self):
        fox = utils.initialize_webdriver('firefox')
        assert type(fox) == utils.webdriver.firefox.webdriver.WebDriver
        fox.quit()

    def test_initialize_chrome_webdriver(self):

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Ruby Mechanize Debug Request Headers

If you are trying to debug your headers:

Start listening on some port:

nc -kl 1234

Then just send a request to that port:

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TP Link Archer T2U

To be able to install drivers on Ubuntu 20.04, use this repo:

https://github.com/aircrack-ng/rtl8812au

A related question

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How to increase and decrease the backlight on Lenovo Z500 with Ubuntu 20.04

Source

1. Open /etc/default/grub
2. Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

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How to use unicode glyphs in i3 status bar?

Source

Install font awesome

sudo apt-get install fonts-font-awesome

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# LUNARLOGIC.IO PROGRAMMING TASK

# Imagine we are organizing a Lunar dinner. 
# 30 people have confirmed that they will come.
# We will all be seating at five 6-person tables (A, B, C, D, E, respectively).
# There will be 3 courses. After each course we'll change our seats.
# We'd like every person to sit with as many different people as possible throughout the dinner.
# As a bonus you may think of future similar occasions where different number of people and tables may be available.

# Write a program that would assign 30 people to their seats (A1, A2, A3, etc., up to E6) during each course with that goal in mind.