[tz] question about SHA512 when using tzdata

Paul Eggert eggert at cs.ucla.edu
Fri Oct 16 08:39:05 UTC 2015

gerar.moisset at orange.com wrote:
> tzupdater tool would update with tzdata version: tzdata2015g
> Error encountered while downloadinghttps://javadl-esd-secure.oracle.com/update/tzupdater/tzdata2015g.tar.gz.sha512

That looks like an Oracle URL, so I'd ask the Oracle folks who are maintaining 
the tzupdater data.

To generate the SHA-512 checksums in the tz release announcements, I use the GNU 
coreutils implementation of the sha512sum command, like the following shell command:

sha512sum tzcode2015g.tar.gz tzdata2015g.tar.gz

The GNU sha512sum command is documented here:


and you can use its -c option to verify a checksum.

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