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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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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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detectlanguage.com

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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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require 'capybara'
require 'selenium-webdriver'

Capybara.register_driver :selenium_w_proxy do |app|
  proxy = Selenium::WebDriver::Proxy.new(http: 'host:port', ssl: 'host:port')
  desired_caps = Selenium::WebDriver::Remote::Capabilities.firefox
  options = Selenium::WebDriver::Firefox::Options.new
  options.add_argument('--headless') # To make the browser headless
  options.add_preference('browser.download.dir', "/some/path/to/folder/") # Custom downloads directory

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How to scroll up/down in Linux Screen?

Enter copy mode:

CTRL-A + [

Then use:

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Source

Simply put $(date +%Y-%m-%d-%H.%M.%S)

mysqldump -u <user> -p <database> | bzip2 -c > <backup>$(date +%Y-%m-%d-%H.%M.%S).sql.bz2

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Wireshark Filter for SSL Traffic

Client Hello:

ssl.handshake.type == 1

Server Hello:

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SELECT table_schema "DB Name",
        ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" 
FROM information_schema.tables 
GROUP BY table_schema; 

Source

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git ls-files --deleted | xargs git rm
git commit