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linux how to see ports in use
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# Any of the following
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sudo lsof -i -P -n | grep LISTEN
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sudo netstat -tulpn | grep LISTEN
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sudo lsof -i:22 # see a specific port such as 22
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sudo nmap -sTU -O IP-address-Here
how to check list of open ports in linux
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sudo lsof -i -P -n | grep LISTEN
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sudo netstat -tulpn | grep LISTEN
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sudo lsof -i:22 # see a specific port such as 22
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sudo nmap -sTU -O IP-address-Here
check what ports are open linux
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## if you use linux
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sudo ss -tulw
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