Images/videos file with bad text metadata inside

[gubi]

Just to keep in memory:

• Create a text file with your message, say "message.txt"
• Now choose target file (it can be any file like a.jpg,a.png,a.exe,..etc), say "image.jpg"
• Now execute follwing command:
  $ copy /b "image.jpg"+"message.txt" "NewImage.jpg"

You can see an example of this by opening an image or video file as text (I used for eg: $ vi example.mp4 - see the red square)

The image above is a gif downloaded from Telegram desktop and directly saved as .mpg file.

This is very very bad!

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Some resources for future purposes:

• Manpage on tracker3 info command: https://man.archlinux.org/man/tracker3-info.1.en
• ExifCleaner app (must be tried): https://github.com/szTheory/exifcleaner
• 👍🏻 Script in cgi-bin that analyze this problem: https://commandlinefanatic.com/cgi-bin/showarticle.cgi?article=art011
• extract manpage: https://linux.die.net/man/1/extract
• GNU Libextractor manual: https://www.gnu.org/software/libextractor/manual/
• A library to extract informations from a png file: https://www.systutorials.com/docs/linux/man/n-png/