How do I recursively unzip nested ZIP files?

Question

Given there is a secret file deep inside a nested ZIP file, i.e. a zip file inside a zip file inside a zip file, etc...

The zip files are named 1.zip, <

Answer 1

Probably not the cleanest way, but that should do the trick:

#!/bin/sh
IDX=1 # ID of your first zip file
while [ 42 ]
do
    unzip $IDX.zip # Extract
    if [[ $? != 0 ]]
    then
        break # Quit if unzip failed (no more files)
    fi
    if [ $IDX -ne 1 ]
    then
        rm $IDX.zip # Remove zip to leave your directory clean
    fi
    (( IDX ++ )) # Next file
done