gistfile1.txt

$ du -hs maillog*
8.6G    maillog.1
8.6G    maillog.1a


$ time gzip -9 maillog.1

real    3m37.652s
user    3m28.382s
sys     0m5.502s





$ time bzip2 -9 maillog.1a

real    20m44.056s
user    20m32.287s
sys     0m5.223s



$ du -hs maillog*
614M    maillog.1a.bz2
1.1G    maillog.1.gz
$ du -ks maillog*
628256  maillog.1a.bz2
1070736 maillog.1.gz