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Slackware HowTo

Use ACLs with setfacl and getfacl on Slackware

Grant precise permissions without reshaping the main owner and group of the data.

Guide by Alessio Varalla

1. When to use it

Useful when classic Unix permissions are not enough to express the access model you actually need.

ACL | setfacl | getfacl | permission delegation | data share

2. Base setup

setfacl -m u:backup:rx /srv/data
setfacl -R -m d:u:backup:rx /srv/data
getfacl /srv/data

Adjust host names, IPs, interfaces, paths, and versions to the real system before making the change persistent.

3. Quick verification

getfacl /srv/data
namei -l /srv/data
getfacl -R /srv/data | head -n 30

Confirm that the output matches the expected state before considering the intervention complete.

4. Operational notes

ACLs do not replace traversal permissions on parent directories: always verify the full path.

Quick checklist

[ ] Steps completed\n[ ] Config updated\n[ ] Tests executed\n[ ] Rollback ready\n[ ] Logs checked

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