cheat-fork-echo/cheat/cheatsheets/lsof

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# List all IPv4 network files
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sudo lsof -i4
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# List all IPv6 network files
sudo lsof -i6
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# To find listening ports:
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lsof -Pnl +M -i4
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# To find which program is using the port 80:
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lsof -i TCP:80
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# List all processes accessing a particular file/directory
lsof </path/to/file>
# List all files open for a particular user
lsof -u <username>
# List all files/network connections a given process is using
lsof -c <command-name>
# See this primer: http://www.danielmiessler.com/study/lsof/
# for a number of other useful lsof tips