strace -t -e trace=open,close,read,getdents,write,connect,accept command-here

# example as found on /usr/share/doc/lxc/examples/lxc-macvlan.conf
# Container with network virtualized using the macvlan device driver
lxc.utsname = alpha
lxc.network.type = macvlan
lxc.network.flags = up
lxc.network.link = eth0 # or eth2 or any of your NICs
lxc.network.hwaddr = 4a:49:43:49:79:bd
lxc.network.ipv4 = 0.0.0.0/24

sudo lxc-execute -n bash-test2 -f lxc-macvlan.conf /bin/bash

$ strace cat test
execve("/bin/cat", ["cat", "test"], [/* 55 vars */]) = 0
/* ... */
open("test", O_RDONLY)                 = 3
/* ... */
read(3, "hellon", 32768)               = 6
write(1, "hellon", 6)                  = 6
read(3, "", 32768)                      = 0
/* ... */