firefoxが46784portで通信している
[linuxstudy@localhost ~]$ lsof -i:46784
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
firefox 3040 linuxstudy 84u IPv4 103812 0t0 TCP localhost.localdomain:46784->55.65.117.34.bc.googleusercontent.com:https (ESTABLISHED)
+|-f [cfgGn]
f by itself clarifies how path name arguments are to be interpreted. When followed by c, f, g, G, or
n in any combination it specifies that the listing of kernel file structure information is to be
enabled (`+') or inhibited (`-').
Normally a path name argument is taken to be a file system name if it matches a mounted-on directory
name reported by mount(8), or if it represents a block device, named in the mount output and associ‐
ated with a mounted directory name. When +f is specified, all path name arguments will be taken to
be file system names, and lsof will complain if any are not. This can be useful, for example, when
the file system name (mounted-on device) isn't a block device. This happens for some CD-ROM file
systems.
When -f is specified by itself, all path name arguments will be taken to be simple files. Thus, for
example, the ``-f -- /'' arguments direct lsof to search for open files with a `/' path name, not all
open files in the `/' (root) file system.
Be careful to make sure +f and -f are properly terminated and aren't followed by a character (e.g.,
of the file or file system name) that might be taken as a parameter. For example, use ``--'' after
+f and -f as in these examples.
$ lsof +f -- /file/system/name
$ lsof -f -- /file/name
file systemって?
[linuxstudy@xxxx ~]$ lsof +f -- /dev/null
lsof: not a file system: /dev/null
lsof 4.87
latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-f[gG]] [+|-e s]
[-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
[+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [-Z [Z]] [--] [names]
Use the ``-h'' option to get more help information.