Uninstalling & Reinstalling Apache2 On Ubuntu 22.04

To uninstall Apache2 on Ubuntu 22.04

$ sudo apt-get purge apache2

Reinstall Apache2 on Ubuntu 22.04

$ sudo apt-get install apache2

Make sure that Apache2 has been correctly installed and is working

$ systemctl status apache2.service

Clear The Node Repl or Console

Node JS is a JavaScript server-side runtime. It can read and write to disk, process text streams and more. Node also includes its own package manager, npm (Node Package Manager), which makes it easy for developers to install third party modules that extend the functionality of their application or provide additional features without managing dependencies manually.

“how to clear screen in node js command prompt” is a question that has been asked many times before. The answer is as follows: “To clear the console, use Ctrl+L.”

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Find Command On Linux

The find command in UNIX is a command line utility for walking a file hierarchy. It can be used to find files and directories and perform subsequent operations on them. It supports searching by file, folder, name, creation date, modification date, owner and permissions. By using the ‘-exec’ other UNIX commands can be executed on files or folders found. 

$ find [where to start searching from]
 [expression determines what to find] [-options] [what to find]

Options :

  • -exec CMD: The file being searched which meets the above criteria and returns 0 for as its exit status for successful command execution.
  • -ok CMD : It works same as -exec except the user is prompted first.
  • -inum N : Search for files with inode number ‘N’.
  • -links N : Search for files with ‘N’ links.
  • -name demo : Search for files that are specified by ‘demo’.
  • -newer file : Search for files that were modified/created after ‘file’.
  • -perm octal : Search for the file if permission is ‘octal’.
  • -print : Display the path name of the files found by using the rest of the criteria.
  • -empty : Search for empty files and directories.
  • -size +N/-N : Search for files of ‘N’ blocks; ‘N’ followed by ‘c’can be used to measure size in characters; ‘+N’ means size > ‘N’ blocks and ‘-N’ means size < ‘N’ blocks.
  • -user name : Search for files owned by user name or ID ‘name’.
  • \(expr \) : True if ‘expr’ is true; used for grouping criteria combined with OR or AND.
  • ! expr : True if ‘expr’ is false.

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When Unsure Of Name Use Wildcard Patterns To Look For A File

To look for a file with a wildcard pattern it may be useful to wrap pattern in single quotes. If you are looking for a file with a .pdf extension, try:

$ find / -name '*.pdf'

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When You Need To Search An Entire Hard Drive

A simple find / -type f -name "" would do the trick if you know exact filename.

find / -type f -iname "filename*" if you want to match more files (ignore case).

Avoid -type option if you want to search for directories etc.

This will also search all mounted devices as well, might want to just search /mount/hddyouwanttosearch

note that one might wish to add sudo ahead of the mentioned command

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Screenshots On Linux Command Line(Chromium)

In order to get a screenshot of a web page(URL) in Chromium, we use this simple syntax structure in our terminal:

[path/to/chromium] --headless --screenshot="[path/to/save/filename.png]" "[URL]"

If you need to find your path to chromium install, use which command like this:

$ which chromium-browser
/usr/bin/chromium-browser

With that bit of information, we can now execute our screenshot command

$ /usr/bin/chromium-browser --headless --screenshot="/home/owl/Pictures/screenshot.png" "https://owlasylum.net"

This only screenshots “above the fold” area. Control screen capture size with --window-size option. Set width to be 1920 pixels (full HD) and height to 3000 pixels. With --hide-scrollbars option, hide scrollbars for more succinct capture.

/usr/bin/chromium-browser --headless --hide-scrollbars --window-size=1920,3000 --screenshot="/home/owl/Pictures/screenshot.png" "https://owlasylum.net"

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Using Youtube-DL

According to their site:

youtube-dl is a command-line program to download videos from YouTube.com and a few more sites.

Youtube-dl provides a means to download videos published online without a third-party. This provides security, convenience, and a certain amount of dependability.

To use it to download videos, I simply navigate to its location on my system(path):

$ cd path/to/youtube-dl.exe

And type in this command:

$ youtube-dl 'http://www.youtube.com/watch?v=P9pzm5b6FFY'

You will be given an output to your screen detailing progress of download. Once completed, you will be able to access your video from same directory as your youtube-dl.exe file.