Newly installed agentpatcher returns error

Hi,

OMS version was just patched to 13.5 RU5 and Agent on OMS host was also patched to 13.5 RU5 after successful install of AgentPatcher in the AGENT_HOME (all on Oracle Linux 7.9).

I started the process to patch the another agent and installed the AgentPatcher version 13.9.5.3.0 in my AGENT_HOME on a host running SunOS version 5.10 (sparcv9). I set the ORACLE_HOME to AGENT_HOME and then cd $ORACLE_HOME/AgentPatcher, and tried to verify the version to ensure it was working (as per the docs). It returned a bad substitution error.

% cat version.txt
AGENTPATCHER_VERSION:13.9.5.3.0
% ./agentpatcher version
./scripts/agent/agentpatcher: bad substitution