本章内容：
# tail /etc/services
nimgtw 48003/udp # Nimbus Gateway
3gpp-cbsp 48049/tcp # 3GPP Cell Broadcast Service Protocol
isnetserv 48128/tcp # Image Systems Network Services
isnetserv 48128/udp # Image Systems Network Services
blp5 48129/tcp # Bloomberg locator
blp5 48129/udp # Bloomberg locator
com-bardac-dw 48556/tcp # com-bardac-dw
com-bardac-dw 48556/udp # com-bardac-dw
iqobject 48619/tcp # iqobject
iqobject 48619/udp # iqobject
#seq 10 | sed -n '1~2p'
1
3
5
7
9
# tail /etc/services |sed -n '/blp5/,+1p'
blp5 48129/tcp # Bloomberg locator
blp5 48129/udp # Bloomberg locator
# tail /etc/services |sed -n '$!p'
3gpp-cbsp 48049/tcp # 3GPP Cell Broadcast Service Protocol
isnetserv 48128/tcp # Image Systems Network Services
isnetserv 48128/udp # Image Systems Network Services
blp5 48129/tcp # Bloomberg locator
blp5 48129/udp # Bloomberg locator
com-bardac-dw 48556/tcp # com-bardac-dw
com-bardac-dw 48556/udp # com-bardac-dw
iqobject 48619/tcp # iqobject
iqobject 48619/udp # iqobject
#感叹号也就是对后面的命令取反。
# tail /etc/services |sed -n '/^blp5/,/^com/p'
blp5 48129/tcp # Bloomberg locator
blp5 48129/udp # Bloomberg locator
com-bardac-dw 48556/tcp # com-bardac-dw
#以逗号分开两个样式选择某个范围
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