nmap command

nmap -sT -P0 <ip>

Command PING kind of "spoof"

ping -n 100 -l 500

example

ping 10.10.10.10 -n 100 -l 500

Command Update, Install and Remove Package In Gentoo

update package database : emerge rsync

install package : emerge [package]

remove package : emerge unmerge [package]

example

install package : emerge xchat

remove package : emerge unmerge xchat

refer

Upgrade + Update Gentoo Without Reinstalling

emerge --sync && emerge -uDN world

refer

Restart MySQL on FreeBSD

/usr/local/etc/rc.d/mysql-server.sh restart