Reduce Disk Space

1
Reduce Disk Space

• compress
• gzip
• tar

2
Shrink the file

• gzip utility works particularly well on files
  with a lot of repeated information such as text
  and image data.
• gzip filename
• Gzip puts .gz to the end of filename
• i.e filename.gz
• -v (verbose) option causes gzip to report the
  amount of reducing of the file
• Eg gzip v filename

3
compress

• As you already know compress can also shrink the
  file size, but usually not as well as gzip.
• Compress utility marks a file it has compressed
  by adding a .Z to its name.

4
To expand the files

• gunzip can restore a file that has been shrunk
  with gzip or compress
• gunzip filename.gz
• zcat utility allows you to view a file that has
  been compressed with either gzip or compress.
• gunzip c is identical to zcat

5
tar

• Tar utility combines a group of files into a
  single file. The resulting file has a .tar
  extension.
• The tar command does not compress files.
  Frequently, therefore a tar file is compressed
  with either gzip or compress, and create a file
  with .tar.gz or .tar.Z extension.

6
tar

• To pack a list of files or the content of a
  directory
• tar options file-name list-of-files (or
  Directory)
• tar cvf tarname.tar Dirname
• tar cvf tarname.tar filea fileb file
• c to create a new archive
• v to print berbose information list each file
  as it is archived
• f to specify the file name you want the
  resulting tar archive be name. It should be the
  last option so as to be preceded by filename

7
To extract the tar

• Now other people who receive our filename.tar
  can extract it.
• tar xvf tarname.tar
• This creates subdirectory tarname and places all
  the original files into it.
• x extract files from an archive
• By the way in front of options of tar command
  is optional. Tar also works without it. Tar
  xvf tarname.tar