cc@cc> echo 'Hello world!' >> test
cc@cc> file test
test: ASCII text
cc@cc> mv test test.1.1
cc@cc> file test.1.1
test.1.1: ASCII text
cc@cc> mv test.1.1 test.1.1.gz
cc@cc> file test.1.1.gz
test.1.1.gz: ASCII text
cc@cc> mv test.1.1.gz t-est
cc@cc> gzip test
cc@cc> file test.gz
test.gz: gzip compressed data, was "test", last modified: Sat Apr  9 02:18:12 2016, from Unix
cc@cc> mv test.gz test.1gz
cc@cc> file test.1gz
test.1gz: gzip compressed data, was "test", last modified: Sat Apr  9 02:18:12 2016, from Unix
cc@cc> mv test.1gz test.1.gz
cc@cc> file test.1.gz
test.1.gz: gzip compressed data, was "test", last modified: Sat Apr  9 02:18:12 2016, from Unix
cc@cc> mv test.1.gz test
cc@cc> file test
test: gzip compressed data, was "test", last modified: Sat Apr  9 02:18:12 2016, from Unix