for file in *.zip ; do if unzip -qq -l $file | awk '{ print $4 }' | grep filename_to_look_for > /dev/null ; then echo $file ; fi ; done

for file in *.zip ; do if unzip -p $file | strings | grep searchstring > /dev/null ; then echo $file ; fi ; done

#!/bin/su
$searchstring=$1
for zipfile in *.zip
do
  unzip -qq -l $zipfile | awk '{ print $4 }' | while read file
  do
    if unzip -p $zipfile $file | grep $searchstring > /dev/null
    then
      echo "$zipfile / $file"
    fi
  done
done