Hi All
a few of us still work on Linux boxes. It is not only important to put users
into groups that should be sharing access to files but the default mask for
file creation should also be set correctly.
In the classical approach this is handled by "umask". This can be redefined
in a session or is defined for a user in .bashrc or .bash_profile for bash.
the value of umask defines the permission for newly created folders and files.
The definition is 777 - umask = permissions for folders and 666 - umask for
files. for example umask = 022 gives 644 as file permissions or rw-r--r--.
In this case only owners can write. For overall group access umask has to be
0002. The leading zero is for the sticky bit and almost always zero.
You can check an users umask by typing umask in a shell.
nest regards
Clemens
On 7/1/2026 2:21 PM, Kenneth Sharp-Knott via groups.io wrote:
Hi Jordan,
I suspect that "NmrSuperUsers" actually corresponds to the "nmrsu" group—that's
the group all the files are owned by. The manual and hotline staff don't seem to
have much Unix expertise; my guess is that most folks up in Billerica are working
primarily on Windows. I'll try that instead of NmrSuperUsers and see how that goes.
As for why this matters: I was instructed to run expinstall whenever changing a
probe. We have quite a few probes on that system—one being a modern DiffBB
probe, with the rest being older-style diffusion probes.
If you care to correct me on the need or lack of need of this, please do!
Best regards,
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)
--
==========================
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Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
15 Fortune Drive NEW Phone: 978-313-5NMR(5667)
Billerica MA 01821 bluesky: _at_canklin.bsky.social
web: http://www.bruker.com
e-mail: clemens.anklin_at_bruker.com
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Received on Fri Jul 03 2026 - 16:57:19 MST