tar: update
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1 4.2.3 Updating an Archive
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1 In the previous section, you learned how to use '--append' to add a file
1 to an existing archive. A related operation is '--update' ('-u'). The
1 '--update' operation updates a 'tar' archive by comparing the date of
1 the specified archive members against the date of the file with the same
1 name. If the file has been modified more recently than the archive
1 member, then the newer version of the file is added to the archive (as
1 with '--append').
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1 Unfortunately, you cannot use '--update' with magnetic tape drives.
1 The operation will fail.
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1 Both '--update' and '--append' work by adding to the end of the
1 archive. When you extract a file from the archive, only the version
1 stored last will wind up in the file system, unless you use the
1 '--backup' option. ⇒multiple, for a detailed discussion.
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