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lsof

List all open files, pipes, ports.

On Ubuntu comes from pre-installed http://packages.ubuntu.com/trusty/lsof package.

Not POSIX compliant and relies on kernel internals, but implemented on many POSIX systems.

Usage:

lsof

Sample output:

COMMAND     PID   TID       USER   FD      TYPE             DEVICE  SIZE/OFF     NODE NAME
gvfsd-fus  1367  1396       ciro  mem       REG                8,8    134296  1445240 /lib/x86_64-linux-gnu/libselinux.so.1
gvfsd-fus  1367  1396       ciro  mem       REG                8,8    100728  1443321 /lib/x86_64-linux-gnu/libz.so.1.2.8

Legend:

  • COMMAND: process name that is using the resource

  • PID: process ID

  • TID: thread ID (same as)

  • USER: username

  • FD: file descriptor

  • TYPE: node type of the file

    Possible types are:

    • REG: TODO
    • TODO other types

  • DEVICE: device number

  • SIZE: file size

  • NODE: inode

  • NAME: full file path

In the call without arguments, most of the files being used will likely be shared libraries used by background jobs or special files from the /proc filesystem.

Check an specific file:

exec 3<> /tmp/foo
lsof /tmp/foo
  #COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
  #bash    22924 ciro    3u   REG    8,8        0 1713824 /tmp/foo
exec 3>&-
lsof /tmp/foo
  #

t

List only process IDs.

Suitable for script consumption.

i

Search for processes listening on a port:

python -m SimpleHTTPServer 3000 &
lsof -i tcp:3000

Output:

COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
python  31297 ciro    3u  IPv4 286614      0t0  TCP *:3000 (LISTEN

Good combo with -t to kill process by port:

kill `lsof -i tcp:3000 -t`