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On Saturday 31 December 2005 14:26, Neil Bothwick wrote: |
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> On Fri, 30 Dec 2005 18:58:17 +0100, Alexander Skwar wrote: |
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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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> |
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> -f, --file [HOSTNAME:]F |
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> use archive file or device F (default "-", meaning stdin/stdout) |
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> |
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> So "-f -" is unnecessary, but harmless. |
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That is true for GNU tar, but not for other versions, so specifying "-f -" is |
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the safest solution. For example the man page tar on Solaris 2.8 says: |
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f File. Use the tarfile argument as the name of the |
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tarfile. If f is specified, /etc/default/tar is not |
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searched. If f is omitted, tar will use the device |
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indicated by the TAPE environment variable, if set; |
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otherwise, it will use the default values defined in |
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/etc/default/tar. If the name of the tarfile is '-', |
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tar writes to the standard output or reads from the |
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standard input, whichever is appropriate. tar can be |
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used as the head or tail of a pipeline. tar can also |
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be used to move hierarchies with the command: |
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example% cd fromdir; tar cf - .| (cd todir; tar xfBp -) |
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The file /etc/default/tar contains a list of tape devices. So on Solaris 2.8 |
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if -f is not specified and $TAPE is not set, which it isn't by default, then |
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tar will use a tape device *not* stdin/stdout |
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Steve |
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-- |
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____________________________________________________________________ |
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Steve Evans E-mail: mailto:stevee@××××××.com |
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WEB: http://www.gorbag.com |
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Registered Linux user #217906: http://counter.li.org |
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Public Encryption Key: http://www.gorbag.com/public-key.html |
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____________________________________________________________________ |
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Now playing: Nina Simone - It might as well be spring |
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2.6.14-gentoo-r5 Intel(R) Pentium(R) 4 CPU 3.00GHz GNU/Linux |
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14:50:29 up 2 days, 21:41, 6 users, load average: 0.21, 0.14, 0.14 |
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I didn't know he was dead; I thought he was British. |
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