os/linux/ FilePermissions

Files have permissions of the from rwx. Normally these for User, Group and Other. In addition, Linux supports ACLs.

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

sudo setfacl -m u:bob:rwx /usr/local/bin

alternatively, you can do this for a group:

sudo setfacl -m g:adm:rwx /usr/local/bin