Files have permissions of the from [rwx](ReadWriteExecute). Normally these for User, Group and Other. In addition, Linux supports [ACLs](AccessControlLists).

## SetFacl
`setfacl` is a tool to set acls; `getfacl` is its counterpart to get them. To e.g. give yourself (say your username is `bob`) write access to `/usr/local/bin`, you use the command
```bash
sudo setfacl -m u:bob:rwx /usr/local/bin
```
alternatively, you can do this for a group:
```bash
sudo setfacl -m g:adm:rwx /usr/local/bin
```