What is the default $SPLUNK_HOME path on *NIX systems?

The default $SPLUNK_HOME path on *NIX systems is indeed /opt/splunk. This path is designated for applications installed on Unix-like operating systems, which typically follow the Filesystem Hierarchy Standard (FHS). The /opt directory is specifically used for optional software packages that are not part of the default installation of the OS.

In the case of Splunk, the installation procedure places the Splunk binaries, libraries, and configuration files in this directory, allowing for organized management of application files. This standard path helps system administrators easily locate and maintain the software.

Other options represent paths generally associated with Windows operating systems. The paths mentioned there are not relevant for *NIX environments, which is why they do not apply here. Understanding this context of directory structure in Unix systems is essential for correctly managing and configuring Splunk installations.