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Neil Bothwick schrieb: |
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> On Fri, 30 Dec 2005 18:58:17 +0100, Alexander Skwar wrote: |
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> |
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>> > tar outputs to stdout by default, |
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>> |
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>> Not always. |
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> |
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> From man tar |
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So, why do you suppose that the command is called |
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"tape (file) archiver"? |
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While you're right as far as GNU tar is concerned, |
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you're wrong as far as the default of tar is concerned. |
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Eg. see the man page of tar on hp-ux, <http://docs.hp.com/en/B2355-90690/tar.1.html>: |
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| f |
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| Use the next arg argument as the name of the archive instead |
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| of the default, /dev/rmt/0m. |
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Or Solaris 10 <http://docs.sun.com/app/docs/doc/816-5165/6mbb0m9u1?q=tar&a=view>: |
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| f |
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| |
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| File. Use the tarfile argument as the name of the tarfile. If |
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| is specified, /etc/default/tar is not searched. If f is omitted, |
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| tar will use the device indicated by the TAPE environment variable, |
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| if set. Otherwise, tar will use the default values defined in |
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| /etc/default/tar |
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> So "-f -" is unnecessary, but harmless. |
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No, "f" is necessary if you don't wish to rely on unknown |
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defaults. Even with GNU tar, you don't know FOR SURE if |
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"-f -" is the default. Who knows? Maybe DEFAULT_ARCHIVE |
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was set to something else while building? |
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|
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Alexander Skwar |
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-- |
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