###hidden some file in picture(JPEG…etc.)
use cat
and pipe
example:
there is a folder includes: a.jpg b.txt c.txt
then use zip
command:
zip hidden.zip b.txt c.txt
cat a.jpg hidden.zip > newPic.jpg
then you get a new JPEG file: newPic.jpg
and it includes hidden.zip
###how to get hidden files?
first rename the file extension name: mv newPic.jpg newPic.zip
use unzip
command: unzip newPic.zip