Know the size of the uncompressed file without extracting
gzip -l <file_name> | awk 'NR==2 {print $2}' | numfmt --to=iec-i --suffix=B
Enddate of ssl certificate
cho | openssl s_client -servername <domain> -connect <domain> 2>/dev/null | openssl x509 -noout -enddate
Find a file recursively
find needs a starting point, . is the current directory
find . -name "*.py"