--verbose (-v) shows details about the results of running
tar. This can be especially useful when the results might not be
obvious. For example, if you want to see the progress of tar as
it writes files into the archive, you can use the --verbose
option. In the beginning, you may find it useful to use
--verbose at all times; when you are more accustomed to
tar, you will likely want to use it at certain times but not at
others. We will use --verbose at times to help make something
clear, and we will give many examples both using and not using
--verbose to show the differences.
Sometimes, a single instance of --verbose on the command line
will show a full, ‘ls’ style listing of an archive or files,
giving sizes, owners, and similar information.
Other times, --verbose will only show files or members that the particular
operation is operating on at the time. In the latter case, you can
use --verbose twice in a command to get a listing such as that
in the former case. For example, instead of saying
tar -cvf afiles.tar apple angst aspic
above, you might say
tar -cvvf afiles.tar apple angst aspic
This works equally well using short or long forms of options. Using
long forms, you would simply write out the mnemonic form of the option
twice, like this:
$ tar --create --verbose --verbose ...
Note that you must double the hyphens properly each time.
Later in the tutorial, we will give examples using --verbose --verbose.
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