[SOLVED] Is there a way to check if a zip file is password protected?

Issue

I'm writing a bash script which compresses (with encryption or without, depending on what the user chooses) and decompresses files using zip. My problem is the decompressing part - when the user chooses a zip file to decompress (via zenity file selection), is there any way to check if the file is password protected in order to ask the user for the password (or if it isn't, just proceed and decompress the file)?

I didn't really try anything yet, as I've struggled to come up with any idea or find a solution on stack and other websites.

Solution

if 7z l -slt file.zip | grep -q ZipCrypto; then
  echo "password protected / encrypted"
else
  echo "no password protection / not encrypted"
fi

See: How to detect zip file encryption algorithm

Answered By - Cyrus

Answer Checked By - David Marino (WPSolving Volunteer)