Gather OS X hardware and software information with system_profiler

system_profiler is a good way to gather lots of recon information about OS X hardware and software. Some examples

     system_profiler -detailLevel full
       Gives you absolutely everything

     system_profiler -listDataTypes
       Shows a list of the available data types.

     system_profiler SPSoftwareDataType SPNetworkDataType
       Generates a text report containing only software and network data.

     system_profiler SPThunderboltDataType SPFireWireDataType
       Just firewire and thunderbolt interfaces