Use of Linux gzip command

gzip [ -acdfhlLnNrtvV19 ] [-S SUFFIX ] [ NAME... ]

-a --ascii
	Use ASCII text mode. Use local conventions when converting end-of-line characters. This option is supported only on some non-Unix systems. For MSDOS, convert CR LF to LF when compressing, and convert LF to CR LF when decompressing
-c, --stdout, --to-stdout
	Output the compressed file to standard output without changing the original file -d, --decompress, --uncompress
	unzip -f, --force
	Force compression or decompression, even if the file has multiple links or the corresponding file already exists, or the compressed data is read from or written to the terminal -h, --help
	Display help information and exit -l, --list
	List relevant information of compressed files -L, --license
	Display copyright information and exit -n, --no-name
	When compressing files, the original file names and timestamps are not saved. When decompressing, the original file name and timestamp will not be restored even if they exist. This option is the default option when decompressing -N, --name
	When compressing, always save the original filename and timestamp; this is the default. When decompressing, the original filename and timestamp are restored if they exist. This option is useful on systems that limit file name lengths or where timestamps are lost after file transfers. -q, --quiet
	Do not display warning messages -r, --recursive
	Recursive processing, process all files and subdirectories under the specified directory together -S, --suffix=SUFFIX
	Change the suffix of the compressed and decompressed files -t, --test
	Test whether the compressed file is correct -v, --verbose
	Display the command execution process -V, --version
	Show version information and exit -#, --best, --fast
	Specifies the compression effect. The compression ratio is a value between 1 and 9. The larger the value, the higher the compression ratio and the lower the compression speed. The default value is 6. --best is equivalent to -9, --fast is equivalent to -1

gzip /etc/passwd

gzip -c /etc/passwd > passwd.gz

gzip -v /etc/passwd
/etc/passwd: 57.9% -- replaced with /etc/passwd.gz

gzip -dv /etc/passwd.gz
/etc/passwd.gz: 57.9% -- replaced with /etc/passwd

ls dir
file1 file2 file3

gzip -rv dir
dir/file3: -10.0% -- replaced with dir/file3.gz
dir/file2: -25.0% -- replaced with dir/file2.gz
dir/file1: -16.7% -- replaced with dir/file1.gz