Contact Information
If you are having problems with the CPTAC Public Data Portal please contact cptac.dcc.help@esacinc.com
We welcome your suggestions for new features. Please send your comments to cptac.dcc@esacinc.com
Software
A python executable script allows direct file transfer from the CPTAC DCC public portal and is subjected to the CPTAC DCC public portal
data use agreement. This program can be downloaded from the CPTAC-DCC Tools
package (Windows, Linux, Python versions are
available). This script can be run from the command prompt to perform the whole directory or single file transfers.
Checksums
Checksum files are used to verify file integrity, providing a way to
check that the local copy of a file is the same as the data-center's
copy of the file. Checksum files are computed on a per-folder basis,
providing the filename, md5, sha1, and files size for all files in a
folder. For folder <folder-name> , the checksum file is called
<folder-name>.cksum. Checksum files can be renamed with their folders,
if necessary, without compromising the checksum file contents.
The checksum files list one file per line, with the values on each line
separated by tabs. Each line provides the md5 hash, the sha1 hash, the
file size in bytes, and the filename, in that order. The files are
listed in (ascii) sorted order. This format makes it particularly easy
to compare two checksum files using standard Unix/Linux tools like grep,
awk, and diff.
The DCC provides a program (cksum) for computing and verifying checksum
files as part of its CPTAC-DCC
Tools package (Windows, Linux, Python versions are available). The checksum files computed by this script are
platform independent, so that they can be computed on one platform and
verified on another.
