(tar.info.gz) prepare for examples

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 2.6.1 Preparing a Practice Directory for Examples
 -------------------------------------------------
 
 To follow along with this and future examples, create a new directory
 called 'practice' containing files called 'blues', 'folk' and 'jazz'.
 The files can contain any information you like: ideally, they should
 contain information which relates to their names, and be of different
 lengths.  Our examples assume that 'practice' is a subdirectory of your
 home directory.
 
    Now 'cd' to the directory named 'practice'; 'practice' is now your
 "working directory".  (_Please note_: Although the full file name of
 this directory is '/HOMEDIR/practice', in our examples we will refer to
 this directory as 'practice'; the HOMEDIR is presumed.)
 
    In general, you should check that the files to be archived exist
 where you think they do (in the working directory) by running 'ls'.
 Because you just created the directory and the files and have changed to
 that directory, you probably don't need to do that this time.
 
    It is very important to make sure there isn't already a file in the
 working directory with the archive name you intend to use (in this case,
 'collection.tar'), or that you don't care about its contents.  Whenever
 you use 'create', 'tar' will erase the current contents of the file
 named by '--file=ARCHIVE-NAME' ('-f ARCHIVE-NAME') if it exists.  'tar'
 will not tell you if you are about to overwrite an archive unless you
 specify an option which does this ( backup, for the information
 on how to do so).  To add files to an existing archive, you need to use
 a different option, such as '--append' ('-r'); see  append for
 information on how to do this.
 

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(tar.info.gz) Creating the archive