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lsof:tldr:ceae6
The command lsof
is used to list open files and the files that are being used by active processes in a Unix-like operating system.
Here is the breakdown of the command:
lsof
: is the command itself, used to list open files.
-i6TCP:${port}
: specifies the internet address and port number, where ${port}
should be replaced with the specific port number you want to check. The -i
flag is used to filter internet addresses and protocols, and 6
denotes IPv6. The TCP
protocol means it will filter for TCP connections only.
-sTCP:LISTEN
: filters the output to only show the processes that are listening for connections. The TCP:LISTEN
parameter means that it will only display the processes in a listening state for TCP connections.
-n
: disables the translation of IP addresses to hostnames. This prevents the command from performing reverse DNS lookups and speeds up the execution.
-P
: disables the translation of port numbers to service names. Similar to -n
, this flag prevents the command from performing port-to-service name lookups.
In summary, this command will list all the open files associated with a specific IPv6 TCP port that is currently in a listening state. The -n
and -P
options are used to speed up the execution by avoiding unnecessary DNS and service name lookups.