chmod 711 — what rwx--x--x means
711
rwx--x--x
The owner has full access; the group and others can execute (enter) but cannot read the listing.
Permission breakdown
When to use 711
Directories you want others to pass through to reach a known file, without being able to list its contents. Used on home directories on shared hosts so users can reach a public_html folder but can't browse each other's files.
Set it with chmod
Apply this permission to a file:
chmod 711 filename
Or apply it recursively to a directory and everything inside it:
chmod -R 711 directory/
Other common permissions
Or build any permission with the interactive chmod calculator.