30 lines
1.1 KiB
Plaintext
30 lines
1.1 KiB
Plaintext
By 1996/12/04, the utmp element size has been changed, in order to
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allow for longer usernames. This change renders all existing wtmp
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files unusable. The cvt-wtmp utility is provided as an aid to convert
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your old wtmp files into the new format, so you don't lose the
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existing track record.
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The tool cannot handle gzip'ed wtmp backups, so unzip them first if
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you need. Then simply call it as:
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./cvt-wtmp /var/log/wtmp*
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The old wtmp files are being renamed to <file>.bak, so nothing will be
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lost even in case of a failure. If you are only about to test whether
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the tool will grok your files correctly, you can run it as:
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./cvs-wtmp -n /var/log/wtmp*
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The tool tries an ``educated guess'', based on the reasonability of
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the timestamp values in the wtmp file. If it fails to recognize the
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format of your wtmp, it normally bails out, or at least ignores
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garbage records. In this case, rename the .bak files to the original
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name, and try to force the conversion:
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./cvs-tmp -f /var/log/wtmp.xxx
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Make sure to verify the result however!
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Dresden, Jan 2, 1996 Joerg <joerg@freebsd.org>
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