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# lsof.txt
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# list all open files
lsof
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# list all open Internet, x.25 (HP-UX), and UNIX domain files
lsof -i -U
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# list all open IPv4 network files in use by the process whose PID is 1234
lsof -i 4 -a -p 1234
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# list all files using any protocol on any port of mace.cc.purdue.edu
lsof -i @mace.cc.purdue.edu
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# find an IP version 4 socket file by its associated numeric dot-form address
lsof -i@128.210.15.17
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#
lsof -ni
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# End of file