getfacl / setfacl
CautionPOSIX ACLs
getfacl <path>
Reads/sets fine-grained ACLs beyond owner/group/other — grant one extra user without regrouping.
Examples
setfacl -R -m u:app:rX /srv/dataGrant read to one user
Syntax
getfacl <path> / setfacl -m u:<user>:rwx <path>
Before you run it
A '+' in ls -l marks ACL-bearing files.
The same reference, with no signal at all
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