# To create a *.gz compressed file
gzip test.txt

# To create a *.gz compressed file to a specific location using -c option (standard out)
gzip -c test.txt > test_custom.txt.gz

# To uncompress a *.gz file
gzip -d test.txt.gz

# Display compression ratio of the compressed file using gzip -l
gzip -l *.gz

# Recursively compress all the files under a specified directory
gzip -r documents_directory

# To create a *.gz compressed file and keep the original
gzip < test.txt > test.txt.gz