ACLs provide finer-grained permissions than traditional file permissions.

1. Setting ACL:

   • Command: setfacl -m u:[username]:[permissions] [filename]

   • Example: setfacl -m u:john:rw file.txt

2. Viewing ACL:

   • Command: getfacl [filename]

   • Example: getfacl file.txt

3. Removing ACL:

   • Command: setfacl -x u:[username] [filename]

   • Example: setfacl -x u:john file.txt