-Rto recurse, or explicitly
a-rto remove read permissions.
chmod -r 0700 dir chmod -r file
chmod -R 0700 dir chmod a-r file
Many tools use
-r for recursive operation, but in
chmod this removes read permissions.
If you wanted to change permissions recursively, change the flag to
-R. If you wanted to remove read permissions, consider using
a-r explicitly to make this more obvious.
If you're using it correctly and don't mind the potential for confusion, you can save a single character by ignoring this warning.
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.