Awk
раствор:
awk 'prev && prev != $3 { print ORS ORS }{ prev = $3 }1' /tmp/info
Выход:
linux01.sys76.com eno83122 Speed: 10000Mb/s
linux02.sys76.com eno83122 Speed: 10000Mb/s
linux03.sys76.com eno83122 Speed: 10000Mb/s
linux01.sys76.com eno83122 Speed: 10000Mb/s
linux02.sys76.com eno83122 Speed: 10000Mb/s
linux03.sys76.com eno83122 Speed: 10000Mb/s
linux01.sys76.com eno83122 Speed: 10000Mb/s
linux02.sys76.com eno83122 Speed: 10000Mb/s
linux03.sys76.com eno83122 Speed: 10000Mb/s
linux01.sys76.com eno83122 Duplex: Full
linux02.sys76.com eno83122 Duplex: Full
linux03.sys76.com eno83122 Duplex: Full
linux01.sys76.com eno83122 Duplex: Full
linux02.sys76.com eno83122 Duplex: Full
linux03.sys76.com eno83122 Duplex: Full
linux01.sys76.com eno83122 Duplex: Full
linux02.sys76.com eno83122 Duplex: Full
linux03.sys76.com eno83122 Duplex: Full
linux01.sys76.com eno83122 Link detected: yes
linux02.sys76.com eno83122 Link detected: yes
linux03.sys76.com eno83122 Link detected: yes
linux01.sys76.com eno83122 Link detected: yes
linux02.sys76.com eno83122 Link detected: yes
linux03.sys76.com eno83122 Link detected: yes
linux01.sys76.com eno83122 Link detected: yes
linux02.sys76.com eno83122 Link detected: yes
linux03.sys76.com eno83122 Link detected: yes