HP t5525 FTP Image Update for HP Linux Thin Clients - Page 5

Image file integrity checking

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Image file integrity checking To make sure the image file was transferred without corruption, you can use an md5 checksum of the image file. To create a file containing the md5sum checksum of the image, use the following command: md5sum -b [FILE] > [FILE].md5 For example, for L1ST3149.DD, issue the following command and place the output in the same directory as the image file: md5sum -b L1ST3149.DD > L1ST3149.DD.md5 NOTE: - 32-MB images require both a .DD file and a .DD.md5 file. - Images greater than 32-MB require only a .DD file. When the automatic FTP update finds an image file and an associated md5 checksum file on the FTP server, FTP update downloads both files to the thin client, performs an md5 checksum on the image file, and compares the result to the md5 checksum file downloaded from the FTP server. If FTP update finds no corruption, it updates the thin client image. If FTP update detects a corruption, it aborts the update and the system boots the old image. © 2005 Hewlett-Packard Development Company, L.P. The information in this document is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. Microsoft, MS-DOS, Windows, and Windows NT are trademarks of Microsoft Corporation in the U.S. and other countries. 411117-001, 11/2005 5

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Image file integrity checking
To make sure the image file was transferred without corruption, you can use an md5 checksum of the
image file. To create a file containing the md5sum checksum of the image, use the following command:
md5sum -b [FILE] > [FILE].md5
For example, for L1ST3149.DD, issue the following command and place the output in the same directory
as the image file:
md5sum -b L1ST3149.DD > L1ST3149.DD.md5
NOTE
: - 32-MB images require both a .DD file and a .DD.md5 file.
- Images greater than 32-MB require only a .DD file.
When the automatic FTP update finds an image file and an associated md5 checksum file on the FTP
server, FTP update downloads both files to the thin client, performs an md5 checksum on the image file,
and compares the result to the md5 checksum file downloaded from the FTP server. If FTP update finds no
corruption, it updates the thin client image. If FTP update detects a corruption, it aborts the update and
the system boots the old image.
© 2005 Hewlett-Packard Development Company, L.P. The information in this document is subject to change without notice. The
only warranties for HP products and services are set forth in the express warranty statements accompanying such products and
services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or
editorial errors or omissions contained herein.
Microsoft, MS-DOS, Windows, and Windows NT are trademarks of Microsoft Corporation in the U.S. and other countries.
411117-001, 11/2005