Upper case turns off a given check. Lower case turns it on.
When you turn off a check, maybe, "no checksums", then all subdirectories inherit that: no checksums are done.
You can always override switches that are inherited from parent directories.
e.g., In the example below, all the stuff under /var/log won't have checksums done, except all the files under /var/log/archives:
/var/log S
/var/log/archive s
... Again, the upper case turns the check off, and the lower case turns it back on.
| letter | check |
|---|---|
| s | checksum |
| i | inode |
| p | permissions |
| l | number of links |
| u | uid |
| g | gid |
| z | file size (redundant if checksums are on) |
| a | access time |
| m | modification time |
| c | file info change time (see lstat(2)) |
| r | reset access time after checksum (option) |