How to Find a String in Each File in a Directory

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How to Find a String in Each File in a Directory


I have the ff. list of files in the dir named /home/joule/unix/archive:
$ /home/joule/unix/archive

What I would like to do is to find this string in a group of files in the directory above:

String to find:

Since I have more than a thousand files to search into, is there any easier way to do this?
# 2  
for file in /home/joule/unix/archive/*.gz; do
  zcat "$file" | grep 20101108


for file in /home/joule/unix/archive/*.gz; do
  zcat "$file" | grep $(date "+%Y%m%d")


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