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tarOperations and Options
tar can take a wide variety of arguments which specify and define
the actions it will have on the particular set of files or the archive.
The main types of arguments to
tar fall into one of two classes:
operations, and options.
Some arguments fall into a class called operations; exactly one of
these is both allowed and required for any instance of using
you may not specify more than one. People sometimes speak of
operating modes. You are in a particular operating mode when you
have specified the operation which specifies it; there are eight
operations in total, and thus there are eight operating modes.
The other arguments fall into the class known as options. You are
not required to specify any options, and you are allowed to specify more
than one at a time (depending on the way you are using
that time). Some options are used so frequently, and are so useful for
helping you type commands more carefully that they are effectively
“required”. We will discuss them in this chapter.
You can write most of the
tar operations and options in any
of three forms: long (mnemonic) form, short form, and old style. Some
of the operations and options have no short or “old” forms; however,
the operations and options which we will cover in this tutorial have
corresponding abbreviations. We will indicate those abbreviations
appropriately to get you used to seeing them. Note, that the “old
style” option forms exist in GNU
tar for compatibility with Unix
tar. In this book we present a full discussion of this way
of writing options and operations (see section Old Option Style), and we discuss
the other two styles of writing options (See section Long Option Style, and
see section Short Option Style).
In the examples and in the text of this tutorial, we usually use the
long forms of operations and options; but the “short” forms produce
the same result and can make typing long
tar commands easier.
For example, instead of typing
tar --create --verbose --file=afiles.tar apple angst aspic
you can type
tar -c -v -f afiles.tar apple angst aspic
tar -cvf afiles.tar apple angst aspic
For more information on option syntax, see Advanced GNU
tar Operations. In
discussions in the text, when we name an option by its long form, we
also give the corresponding short option in parentheses.
The term, “option”, can be confusing at times, since “operations”
are often lumped in with the actual, optional “options” in certain
general class statements. For example, we just talked about “short and
long forms of options and operations”. However, experienced
users often refer to these by shorthand terms such as, “short and long
options”. This term assumes that the “operations” are included, also.
Context will help you determine which definition of “options” to use.
Similarly, the term “command” can be confusing, as it is often used in
two different ways. People sometimes refer to
tar command is the entire command line of user input
tar what to do — including the operation, options,
and any arguments (file names, pipes, other commands, etc.). However,
you will also sometimes hear the term “the
tar command”. When
the word “command” is used specifically like this, a person is usually
referring to the
tar operation, not the whole line.
Again, use context to figure out which of the meanings the speaker
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