Examples of using the lsof command in Linux

Enter lsof under the terminal to display the system open files, because the lsof need to access core memory and various files, so you must run it as root to fully perform its function

LSOF-PNL +m-i4
LSOF-PNL +m-i6
Ls-i: 80

Add: Practical command

The code is as follows

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Lsof ' which HTTPd '//That process is using the Apache executable file LSOF/ETC/PASSWD//That process is occupying/etc/passwd Lsof/dev/hda6//That process is taking up Hda6 lsof/dev/ CDROM//That process is seizing the optical drive Lsof-c sendmail//Viewing file usage of SendMail process Lsof-c courier-u//showing that the files were opened with a ^zahn-preceded process, but not On the user Zahn Lsof-p 30297//display those files are open by the PID 30297 process lsof-d/TMP displays all instance and file processes opened in the/tmp folder. However, the symbol file is not in the column lsof-u1000//View file usage for the process of the user with the UID of 100 Lsof-utony//View file Usage for user Tony's process Lsof-u^tony// View file usage for a process that is not a user Tony (^ is the reverse meaning) Lsof-i//Display all open ports lsof-i:80//Show all open 80 ports process Lsof-i-u//Show all open ports and Unix DOMA In file Lsof-i udp@[url]www.akadia.com:123//display links to the 123 (NTP) ports that the process has opened to www.akadia.com UDP Lsof-i Tcp@ohaha.ks.edu.tw:ftp-r//Constantly view the current FTP connection (-r,lsof will always continue to execute until the interrupt signal is received, +r,lsof will always execute until no files are displayed, default is 15s refresh) Lsof-i Tcp@ohaha.ks.edu.tw:ftp-n//lsof-n does not convert IP to hostname, the default is not to add the-n parameter

lsof Command parameter Interpretation

1-P: This option constrains the conversion of the port number of the network file to the ports name. Constraint conversions can make lsof run faster. This is useful when the search for a port name does not work.
2-N: This option constrains the conversion of the port number of the network file to the host name. Constraint conversions can make lsof run faster. It is useful when the search for a host name does not work.
3-L: This option constrains the conversion of the user ID number to the login name. This option is useful when the Sign-in name lookup is incorrect or slow.
4) +m: This option supports registration reports for local TCP and UDP port mapper programs.
5)-i4: Only the ports under the IPV4 protocol are listed.
6)-i6: Only the ports under the IPV6 protocol are listed.