What does the perl -pi -e 's|\x81\x78\x30\x6B... command do?

Question

Perl

The actual command:

sudo perl -pi -e 's|\x81\x78\x30\x6B\x10\x00\x00\x0F\x85|\x81\x78\x30\x6B\x10\x00\x00\x90\xE9|' /System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AirPortBrcm4331.kext/Contents/MacOS/AirPortBrcm4331

I want to understand what it changes in the file and modify another file in the same way.

Answer 1

replaces \x81\x78\x30\x6B\x10\x00\x00\x0F\x85with \x81\x78\x30\x6B\x10\x00\x00\x90\xE9
Once per string the first inclusion.

Answer 2

This command disables 802.11d on the card