Share files on UITS supercomputers with other users

Owned by Former user (Deleted)
Last updated: Jul 10, 2020 by Former user (Deleted)
1 min read

Prerequisites

  1. Secure your own environment.

Directions

  1. Open a terminal (command line) window on the supercomputer.

  2. Use POSIX ACLs (access control list), an extension of normal Unix permissions.

  3. To give another user with username "mycollaborator" read and write access to a specific file called "filename":

    setfacl --modify user:mycollaborator:rw- filename

    The ACL on the file will be visible by a "+" sign at the end of a long file listing:

    $ ls -l
-rw-rw----+ 1 myusername myusername 4194304 Mar  4 10:40 filename

  4. To list the ACLs:

    getfacl filename

    which will show:

    # file: filename
# owner: myusername
# group: myusername
user::rw-
user:mycollaborator:rw-
group::---
mask::rw-
other::---

Approvals

IU supercomputers are approved for PHI,  but subject to "Shared responsibility model for securing PHI on UITS systems".

We want your feedback

Please email securemyresearch@iu.edu to report errors/omissions and send critiques, suggestions for improvements, new use cases/recipes, or any other positive or negative feedback you might have.  It will be your contribution to the Cookbook and appreciated by all who use it.