nmap

# search hosts
nmap -sP 192.168.1.*

# scan for open ports
sudo nmap -T4 -sS 192.168.1.100

# get more detailed information
sudo nmap -O 192.168.1.100 -T4

# scan one port
nmap -sV -P0 -p 22 -vv 192.168.1.100

# LINKS
http://linuxwiki.de/nmap

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