Tcpdump

TCP Dump
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$ sudo tcpdump -s 0 -A host www.uol.com.br and port 80 #Show ASCII
$ sudo tcpdump -s 0 -X host www.uol.com.br and port 80 #Show Hexdump and ASCII

#Filter only packages in port range from 4210-4218, with tcp-flag Push, and do not buffer output with "-l" so I can pipe and don't freeze

$ sudo tcpdump -l -i eth0 -X -s 0 -n 'host snelnxa124 and portrange 4210-4218 and (tcp[tcpflags] & (tcp-push) != 0)'
$ sudo tcpdump -l -i eth0 -A -s 0 -n 'host snelnxa124 and portrange 4210-4218 and (tcp[tcpflags] & (tcp-push) != 0)' | grep -v Flags
$ sudo tcpdump -l -i eno1  -A -s 0 -n 'host www.ic.unicamp.br and tcp port http'

Extra
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$ telnet towel.blinkenlights.nl #Star wars ascii

https://goo.gl/AwpNxV
https://fwknowledge.wordpress.com/2013/03/05/tcpdump-flags/
https://www.wains.be/pub/networking/tcpdump_advanced_filters.txt