$ gzip -v letter e

letter_e:      99.6%  replaced with letter_e.gz

$ Is -1

-rw-rw-r-- 1 alex   speedy   2030 Jul 31 06:07 letter e.gz

     2030 .  gzip  
,      .gz.    
,   ; ,  ,        
  .  gzip    , -
  ,       .

 ,  ,   card2 .bm   -
   :

$ Is -1

-rw-rw-r 1 jenny   speedy 131092 Jul 31 10:48 card2.bm

   gzip       
   20%:

$ gzip -v card2.bm

card2.bm:        19.7%  replaced with card2.bm.gz
$ Is -1

-rw-rw-r 1 jenny   speedy 105261 Jul 31 10:48 card2.bm.gz

   compress     ,    ,
 gzip.  compress ,   ,      . Z.

gunzip  zcat:  

  ,     gzip  compress, 
  gunzip (GNU unzip):

$ gunzip letter_e.gz
$ Is -1

-rw-rw-r 1 alex    speedy 584000 Jul 31 06:07 letter_e

$ gunzip card2.bm.gz

$ Is -1

-rw-rw-r 1 jenny   speedy 131092 Jul 31 10:48 card2.bm

 zcat  ,    gzip  compress.  -
 cat   .gz  .Z,  zcat     
 .   cat,  zcat    .  
   zcat  ,    
      head,      :

$ zcat letter e.gz | head -2

  zcat   letter_e.gz  ;   
      .

168  11.   Red Hat Linux