gzip with -9 option

 
A log file: with size of: 789M

gzip with different option, to have different compression as below

gzip -9 file.log

32M

gzip -9 file.log

37MB

example #2

-rw-r--r--. 1 srvusr srvusr  87M Jul 18 19:53 output.log.20220718_pm074234.log

-rw-r--r--. 1 root   root    87M Jul 21 12:01 output.log.20220718_pm074234.without9.log

sudo gzip -9 output.log.20220718_pm074234.log

sudo gzip output.log.20220718_pm074234.without9.log

-rw-r--r--. 1 srvusr srvusr 4.0M Jul 18 19:53 output.log.20220718_pm074234.log.gz

-rw-r--r--. 1 root   root   4.2M Jul 21 12:01 output.log.20220718_pm074234.without9.log.gz