How do i check statistics on compression tools?

mountaing

Compression utilities can display statistics, a feature that's not often used, but can be useful when doing file network transfers or when attaching files to emails.

gzip.

$ gzip -l gerrit-2.13.2.war.gz 
         compressed        uncompressed  ratio uncompressed_name
           51014935            51110416   0.2% gerrit-2.13.2.war

xz.

$ xz -l node-v4.4.4-linux-x64.tar.xz
Strms  Blocks   Compressed Uncompressed  Ratio  Check   Filename
    1       1  8,095.6 KiB     39.1 MiB  0.202  CRC64   node-v4.4.4-linux-x64.tar.xz

unzip.

$ unzip -Zt awscli-bundle.zip 
17 files, 8423562 bytes uncompressed, 8391121 bytes compressed:  0.4%

bzip2.

$ bzip2 -v python-2.7.13.tar
  python-2.7.13.tar:  4.144:1,  1.930 bits/byte, 75.87% saved, 135608320 in, 32721304 out.