$ cp /bin/ls /etc/httpd/conf/httpd.conf .
$ ls -l httpd.conf ls
-rw-r--r-- 1 student student  11753  2月 26 12:02 httpd.conf
-rwxr-xr-x 1 student student 117608  2月 26 12:02 ls

##### gzip (.gz)
$ gzip -v httpd.conf ls
httpd.conf:      61.4% -- replaced with httpd.conf.gz
ls:      53.3% -- replaced with ls.gz
$ ls -l httpd.conf.gz ls.gz
-rw-r--r-- 1 student student  4562  2月 26 12:02 httpd.conf.gz
-rwxr-xr-x 1 student student 54976  2月 26 12:02 ls.gz
$ gunzip httpd.conf.gz ls.gz

##### xz (.xz)
$ xz -v httpd.conf ls
httpd.conf (1/2)
  100 %          4,516 B / 11.5 KiB = 0.384
ls (2/2)
  100 %        46.6 KiB / 114.9 KiB = 0.406
$ ls -l httpd.conf.xz ls.xz
-rw-r--r-- 1 student student  4516  2月 26 12:02 httpd.conf.xz
-rwxr-xr-x 1 student student 47712  2月 26 12:02 ls.xz
$ unxz httpd.conf.xz ls.xz

##### bzip2 (.bz2)
$ bzip2 -v httpd.conf ls
  httpd.conf:  2.699:1,  2.964 bits/byte, 62.95% saved, 11753 in, 4354 out.
  ls:          2.126:1,  3.764 bits/byte, 52.95% saved, 117608 in, 55329 out.
$ ls -l httpd.conf.bz2 ls.bz2
-rw-r--r-- 1 student student  4354  2月 26 12:02 httpd.conf.bz2
-rwxr-xr-x 1 student student 55329  2月 26 12:02 ls.bz2
$ bunzip2 httpd.conf.bz2 ls.bz2