Bug 41666

This may or may not be a bug, depending on your documentation policy. :) I noticed that there are several mentions in the current documentation of "sysctl -w", although the "-w" doesn't mean anything on current systems. If your goal with the documentation is to focus on the current systems, it might make sense to remove the now-useless "-w" option from these examples. However, if you want to leave it there to remain compatible with older versions of FreeBSD, that makes sense too.

Fix: 

Remove "-w" option in these locations
How-To-Repeat: Here's a simple grep that catches several mentions of this. There may be others:

[/usr/share/doc/handbook]
root@reidhosp> grep -R 'sysctl -w' * ../faq/
book.html:              command <tt class="COMMAND">sysctl -w
book.html:                      class="COMMAND">sysctl -w
book.html:"USERINPUT"><b>sysctl -w kern.fallback_elf_brand=3</b></tt>
Binary file book.txt matches
linuxemu-mathematica.html:"USERINPUT"><b>sysctl -w kern.fallback_elf_brand=3</b></tt>
linuxemu-mathematicau.html:"USERINPUT"><b>sysctl -w kern.fallback_elf_brand=3</b></tt>
natd.html:                "COMMAND">sysctl -w net.inet.ip.forwarding=1</tt>
pppoe.html:        class="COMMAND">sysctl -w
./faq/book.html:"USERINPUT"><b>sysctl -w kern.timecounter.method=1</b></tt>
./faq/book.html:"USERINPUT"><b>sysctl -w kern.timecounter.hardware=i8254</b></tt>
./faq/book.html:"USERINPUT"><b>sysctl -w vfs.usermount=1</b></tt>
./faq/book.html:"USERINPUT"><b>sysctl -w net.inet.icmp.icmplim=300</b></tt>
./faq/book.html:"USERINPUT"><b>sysctl -w net.inet.icmp.icmplim_output=0</b></tt>
./faq/troubleshoot.html:"USERINPUT"><b>sysctl -w kern.timecounter.method=1</b></tt>
./faq/troubleshoot.html:"USERINPUT"><b>sysctl -w kern.timecounter.hardware=i8254</b></tt>
./faq/networking.html:"USERINPUT"><b>sysctl -w net.inet.icmp.icmplim=300</b></tt>
./faq/networking.html:"USERINPUT"><b>sysctl -w net.inet.icmp.icmplim_output=0</b></tt>
Binary file ../faq/book.txt matches
./faq/disks.html:"USERINPUT"><b>sysctl -w vfs.usermount=1</b></tt>