[Bug-tar] Missing info in documentation of tar utility.

[Matthew Wakeling]

I would like to point out a possibly confusing behaviour in tar, which
does not seem to be documented in the tar info page.

If you run (for example):
1. tar -cg list -f arc1.tar somedir
and then run
2. tar -cg list -f arc2.tar somedir someotherdir
then only the contents of someotherdir that were created since the
first command will be placed into arc2.tar

I know this is very logical behaviour, but it may catch someone who is
writing a backup script out (like it did me).

Matthew

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