Easy linux cli steganography no additional packages needed, but you can use them for more options for hiding/encrypting (thanks @kravietz for this discovery). Steganography is term for hiding one file into another.
1. Zip any file and have one simple.jpeg image
2. In your cli type: cat simple.jpeg file.zip > hidden.jpeg
hidden.jpeg is same image but different in size, summing up to file.zip+simple.jpeg
To reveal hidden files just type in your cli: unzip hidden.jpeg. One of the packages you can use for more options like more compression options, file extensions and encryption is steghide for linux, but I haven't used it myself. There are methods for identifying hidden files, so if you use steganography make sure to encrypt files first (using PGP, for example) and don't hide too large files so it won't be obvious that something is hidden (for example 500x400 image with 50mb size)
