wc gzipped files?

I use too "cat file_name | gzip -d | wc -l"

You can use zgrep to count lines as well (or rather the beginning of lines)

zgrep -c ^ file.txt

Try this zwc script:

#! /bin/bash --
for F in "$@"; do
  echo "$(zcat -f <"$F" | wc -l) $F"
done