cp /dev/zero filename creates large files

Don Sharp dwsharp@iee.org
Thu Sep 25 09:28:00 GMT 2003


I carried out the following sequence of commands

$ for i in `cat /tmp/d`; do if [ -f $i.idx ]; then ls -l ${i}*; fi; done
-rw-r--r--    1 don      None            0 Jun 17  1998 dtaq
-rw-r--r--    1 don      None         3072 Jun 17  1998 dtaq.idx
$ cp /dev/zero dtaq.idx

The cp appeared to be hanging and the disc was rattling away, so in
another window I typed in

$ ls -l dtaq*
-rw-r--r--    1 don      None            0 Jun 17  1998 dtaq
-rw-r--r--    1 don      None     65307648 Jun 17  1998 dtaq.idx

and you can see that the reported size of the target of the 'cp
/dev/zero' has grown to a considerable size in a short time.

Can anyone else reproduce this?

Attaching cygcheck.log


Don Sharp
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