$> ls -la *csv
-rw-rw-r-- 1 user at 0 Jun 23 15:22 1.csv
-rw-rw-r-- 1 user at 0 Jun 23 15:22 2.csv
-rw-rw-r-- 1 user at 0 Jun 23 15:22 3.csv
$> gzip *csv
$> ls -la *csv*
-rw-rw-r-- 1 user at 26 Jun 23 15:22 1.csv.gz
-rw-rw-r-- 1 user at 26 Jun 23 15:22 2.csv.gz
-rw-rw-r-- 1 user at 26 Jun 23 15:22 3.csv.gz
$>