|Original author(s)||Victor A. Abellre|
4.93.2 / 8 May 2019
|Operating system||Linux and FreeBSD|
lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them. This open source utility was developed and supported by Victor A. Abell, the retired Associate Director of the Purdue University Computing Center. It works in and supports several Unix flavors.
Open files in the system include disk files, named pipes, network sockets and devices opened by all processes. One use for this command is when a disk cannot be unmounted because (unspecified) files are in use. The listing of open files can be consulted (suitably filtered if necessary) to identify the process that is using the files.
# lsof /var COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME syslogd 350 root 5w VREG 222,5 0 440818 /var/adm/messages syslogd 350 root 6w VREG 222,5 339098 6248 /var/log/syslog cron 353 root cwd VDIR 222,5 512 254550 /var -- atjobs
To view the port associated with a daemon:
# lsof -i -n -P | grep sendmail sendmail 31649 root 4u IPv4 521738 TCP *:25 (LISTEN)
From the above one can see that "sendmail" is listening on its standard port of "25".
One can also list Unix Sockets by using
The lsof output describes: