option is much more efficient because *-p* option works at a much earlier
stage of processing than the *-Q* option.
-*-i[4|6]*, *--inet[=4|6]::
+*-i*[4|6], *--inet*[=4|6]::
List only IPv4 sockets and/or IPv6 sockets.
*-Q*, *--filter* _expr_::
If pid namespaces are supported then this function will also print
the pid of a given pidfd refers to for all descendant pid namespaces
starting from the current pid namespace of the instance, i.e. the
-Pid field and the first entry in the NSpid field will be identical.
-...
+Pid field and the first entry in the NSpid field will be identical. +
+... +
Note that this differs from the Pid and NSpid fields in
/proc/<pid>/status where Pid and NSpid are always shown relative to
-the pid namespace of the procfs instance.
+the pid namespace of the procfs instance.
____
PIDFD.PID <``number``>::