"We have already discussed in the previous two articles about file and folder permissions along with special permissions that are supported in linux. The permissions are effective for many scenarios. But what happens when you need more granularity? How do you grant write access to a file to just one specific user who isn't the owner and isn't in the owning group?"
"How do you allow two different groups read access, but only one of them write access? How do you ensure files created in a shared directory automatically get specific permissions for a certain team? Trying to juggle group memberships for these cases quickly becomes a nightmare. This is where Access Control Lists (ACLs) come in. They provide a more flexible, fine-grained permission mechanism that extends the traditional ugo/rwx model."
Access Control Lists (ACLs) enable more granular permissions than the standard user/group/other (ugo/rwx) model. ACLs allow granting specific rights to individual users who are neither the file owner nor members of the owning group. ACLs permit assigning different access levels to multiple groups, such as read for one group and write for another. ACLs can enforce default permissions for files created within a shared directory so team-specific privileges apply automatically. ACLs reduce reliance on complex group membership juggling and simplify shared resource management. ACLs extend traditional permission mechanisms for finer access control.
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