The user who had this question actually solved the issue already, so I'm posting the answer here on his behalf. Here is what he said:
Those scripts are all from the *nix add-on, and are enabled by default (and should be anyway). The scripts were running locally on our Splunk linux machines as the Splunk service account (which is should be). But, the Splunk service account needed some additional permissions and configurations then what we had set up originally, which is why I was seeing those problems.
I encountered these errors on the same scripts (and some other ones) on his other Splunk servers, and figured out how to fix them. Here is what I did:
rlog.sh — the splunk service account needs read and execute permissions on the directory /var/log/audit and read permissions on the file /var/log/audit/audit.log
time.sh and lsog.sh — the splunk service account needs the following additions to the its PATH variable: /sbin:/usr/sbin:/usr/local/sbin
So, I made the noted changes and those scripts are no longer throwing any errors.
